SKU: 34500979359

KomeStone K1 Rock Tumbler Kit - 2.5LB Capacity, Digital Timer, Variable Speeds, Brush Motor, 11.3x9.17x5.87 inches

$73.76 $81.95
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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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Description

KomeStone K1 Rock Tumbler Kit - 2.5LB Capacity, Digital Timer, Variable Speeds, Brush Motor, 11.3x9.17x5.87 inchesThe KomeStone Advanced Professional Rock Tumbler Kit is an innovative geology STEM toy designed for both kids and adults. This versatile rock polisher allows users to transform rough rocks into smooth gemstones while providing an engaging educational experience. Constructed with a high quality Japanese carbon motor, this rock tumbler features a brush motor variant known as K1. The design prioritizes user friendliness and educational value, making it

The KomeStone Advanced Professional Rock Tumbler Kit is an innovative geology STEM toy designed for both kids and adults. This versatile rock polisher allows users to transform rough rocks into smooth gemstones while providing an engaging educational experience.

Constructed with a high-quality Japanese carbon motor, this rock tumbler features a brush motor variant known as K1. The design prioritizes user-friendliness and educational value, making it an ideal tool for learning about geology and patience. The kit includes a full-color illustrated learning guide, ensuring that even beginners can successfully operate the tumbler. With its advanced features, the KomeStone kit is perfect for hobbyists and budding geologists alike.

Key Features:
  • Original Manufacture & Brand Outlet: The KomeStone brand ensures quality with its unique rock tumbler design.
  • Complete Kit: Includes tumbler machine, barrel, 1 lb of rough rocks, three belts, four polishing grits, ceramic filler media, and an instructional book.
  • Enhanced Performance: Equipped with a 9-day timer display, three-speed controls, and pause & resume functions for customized polishing experiences.
  • Extra Large Capacity: The 2.5 lb barrel allows for polishing more rocks simultaneously compared to standard 1 lb drums.
  • Low Noise Operation: Features 100% soft rubber barrels that reduce noise levels by 75%, making it quieter than traditional plastic drums.
  • Educational Value: A hands-on tool for learning about geology, patience, and the art of jewelry making, suitable for all ages.
  • Upgraded User Experience: The LCD screen and various polishing recipes enhance the overall fun and effectiveness of rock tumbling.

The KomeStone Advanced Professional Rock Tumbler Kit is an excellent choice for educators, parents, and rock enthusiasts. This comprehensive kit encourages creativity and scientific exploration, making it a thoughtful gift for all ages. Whether you are polishing rocks for jewelry making or simply enjoying the process of transformation, this tumbler offers a rewarding experience that blends learning with fun.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 34500979359

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4.1 ★★★★★
Based on 14 reviews
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Product Reviews
F
Verified Purchase
f.b.
Lowell, US
★★★★★ 5
love this!
So far I’m loving this cold brew kit in most every way. That said, I want to get the bad out of the way first: Even with careful attention to stirring the grounds my mesh filler was damaged within the first few brews. It’s just honestly disappointing because I love this kit to the fullest in every other way. It fits perfectly in my refrigerator door. The bumper at the bottom ring gives me peace of mind for protecting against the occasional bump. The filter, even with its weaknesses is well thought out. My brew is about how I like it after ~24+ hours of steeping. It has a convenient removable cap on the bottom to help remove used coffee grounds (your compost or worm bin will thank you!!!) The handle is comfortable and very convenient. I love the lid. It fits very very nice and snug and the design is very well thought out. Being able to pour my coffee without performing a juggling act is a relief. A simple turn of the lid and, “voila!” As a whole this cold brew maker is very attractive to use and store. It’s a mostly premium look and experience at what seems to be a competitive price at the time of my purchase. I will try to source glue to repair my filter and if that fails then look into a replacement from the company. EDIT: I was confident the company would reach out to me to make things right with an offer to replace my filter with their updated model. Have not heard back as of yet. Would certainly change my review back to 5* if they made this right. A product should not fail so soon - especially with the special care & attention I’d given it. EDIT2: Amanda and Justin were very quick to replace my filter once I found their email and messaged them my order number and explained my situation. 5 star product 5 star customer service.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 14, 2020
F
Verified Purchase
F.A.B
Lexington, US
★★★★★ 5
Very good cold brewer.
This cold brew coffee maker is great. I was a little skeptical about it when I was shopping for one. But for such an inexpensive price and Amazon's great return policy, I would try it out. Well I'm glad I did! Even before it got to me, the seller sent me an email with some suggestions on how to cold brew and a pdf attachment with some nice recipes. I also bought a can of Cafe Du monde coffee to use with it. When it arrived, I went right in. I unboxed the brewer, and was really impressed with the quality of it. Very well made. The filter is strong and the removable rubber bottom of the carafe is a really good idea to make it non-slip. I like my coffee strong, so I filled the filter with coffee to the top. Especially if you are going to add ice later to your drink, make it strong. When your filter is halfway filled with coffee, fill the carafe with water halfway as well. Mix the coffee in the filter a little bit. Then fill the filter to the top with coffee and then fill with water. Give it another couple stirs and place in the fridge. When carrying to the fridge make sure to hold the bottom of the carafe. The handle is not as strong when filled with water. Come back the next day and stir some more. Later that day, or even the next day, your coffee is ready to go. I made Vietnamese coffee with mine. I put some sweetened condensed milk on the bottom of my glass ,with a splash of milk or half and half, then ice and cold coffee. AMAZING! Worth the wait. Not bitter, but not overly sweet either. Great taste with the cafe du monde coffee. Go get yourself one of these and enjoy. I am going to try the pumpkin spice one, that is in the recipe book the seller emailed me next. Can't wait!!!
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Reviewed in the United States on February 25, 2017
L
Verified Purchase
Lauren D.
West Palm Beach, US
★★★★★ 5
Game-Changer for Cold Brew Lovers
This cold brew maker is so affordable and surprisingly amazing. I’ve stopped using my fancy Ninja machine—cold brew from this tastes so much better. It’s super convenient to have a full container ready in the fridge each morning, and it makes enough to last the whole week. Total game-changer!
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Reviewed in the United States on July 11, 2025
K
Verified Purchase
KnightinTunisia
Charlottesville, US
★★★★★ 5
Good cold brew maker…
Style: 1pcs 64oz black
Very much into cold brew now for several years and wanted to give this type of maker a try. Since I wasn’t sure if I would like it or not, I decided to go with the cheapest one and it was available with same-day delivery to boot! It is a winner! It is simple to use. Just fill the filter about 2/3 of the way full with coarse ground coffee and fill with water. You can let it sit in the refrigerator or on your countertop at room temperature. I think room temperature brews a little bit quicker. A very big plus is the metal mesh filter. It cleans and rinses off very easily. The lid and jar seem to be of excellent quality. I purchased the 64 ounce because I love my cold brew, but it is a little bit bulky and heavy for us senior citizens.
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Reviewed in the United States on May 20, 2026
M
Verified Purchase
mary f williams
Waukegan, US
★★★★★ 5
Perfect Cold Brew Coffee
Style: 1pcs 64oz black
Works like a charm. The mesh filter actually prevents grounds from collecting in the coffee and is easy to clean. Don’t use fine, ground coffee but slightly grounded beans for a robust flavor. You can’t beat the price of this simple, uncomplicated brewer.
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Reviewed in the United States on June 3, 2026

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