KomeStone Ultra Quiet Brushless Rock Tumbler Kit – 7lb Capacity Dual-Barrel with Noise-Cancelling Cover, Up to 6× Quieter, Include All Accessories, Professional Rock Polisher for Adults & Gift Giving

Features

• 𝐍𝐞𝐞𝐝 𝐞𝐱𝐭𝐫𝐚 𝐛𝐞𝐥𝐭𝐬 𝐨𝐫 𝐬𝐭𝐨𝐧𝐞𝐬 ($𝟑𝟎 𝐯𝐚𝐥𝐮𝐞)? Reach out after purchase for free spares - to keep your tumbling running at its best.
• 𝟏-𝐘𝐞𝐚𝐫 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲 & 𝟗𝟎-𝐃𝐚𝐲 𝐌𝐨𝐧𝐞𝐲-𝐁𝐚𝐜𝐤 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞: Enjoy peace of mind with our extended 90-day refund guarantee and 1-year warranty. If you miss Amazon's 30-day return window, simply contact our 𝐔𝐒-𝐛𝐚𝐬𝐞𝐝 𝐜𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐬𝐞𝐫𝐯𝐢𝐜𝐞 team for 𝐡𝐚𝐬𝐬𝐥𝐞-𝐟𝐫𝐞𝐞 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐨𝐫 𝐫𝐞𝐟𝐮𝐧𝐝 𝐚𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐜𝐞. We offer 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐬𝐮𝐩𝐩𝐨𝐫𝐭 to ensure your complete satisfaction.
• Ultra Quiet Operation with Brushless Motor & Noise-Canceling Cover: Powered by a next-generation brushless motor, the KomeStone K4 delivers smooth, stable operation with a lifespan of over 20,000 hours—equivalent to over 10 years of weekly use. Paired with our custom noise-canceling cover and dual rubber barrels, this rock tumbler kit is up to 6× quieter than others. Compared to plastic-barrel models, it reduces noise by up to 75%, making it ideal for homes, classrooms, and shared spaces.
• 7lb Dual-Barrel Capacity for Polishing More at Once: This dual-barrel rotary tumbler handles up to 7 pounds of rocks in one cycle—perfect for polishing coarse and fine grit simultaneously. Whether you’re restoring gemstones or prepping materials for jewelry, this stone polisher offers high-volume performance in a compact footprint, great for hobbyists, crafters, and serious collectors.
• Precision Control with 4 Speeds & 9-Day Timer: The digital panel gives you full control over every stage. Choose from 4 speed levels, program up to 9 days, and enjoy features like auto shutoff, memory recall, and a polishing progress log. Ideal for repeatable, hands-free use, this polishing machine delivers consistent results with zero guesswork.
• Complete STEM Kit with Full Accessories for Kids & Adults: Everything you need is included: 2 lbs of assorted rocks, 8 polishing grits, ceramic pellets, jewelry findings, belts, strainer, and a colorful step-by-step guide. Great for beginners and seasoned tumblers alike, this STEM-friendly rock tumbler kit is perfect for kids, parents, educators, and DIY enthusiasts.
• U.S.-Based Support, 1-Year Warranty, Lifetime Help: Your purchase is backed by KomeStone’s commitment to customer satisfaction. We offer a 1-year warranty covering free replacement of all accessories, plus lifetime technical support from our dedicated U.S.-based team. Whether you’re using this quiet rock tumbler for agates, gemstones, or jewelry polishing, we’re here every step of the way—ensuring peace of mind for beginners and pros alike.
• Spare Belt Support – We're Always Here to Help: The belt may wear out for long-term use. If it breaks or if you’d like to keep spares on hand, feel free to reach out anytime after purchase—we’ll be happy to send you some extras.