Description
• RANKED #1 BY LEADING REVIEWERS — TRUSTED BY THOUSANDS OF FAMILIES: The KomeStone K1 Rock Tumbler was ranked the #1 Rock Tumbler by top independent product reviewers, recognized for performance, safety, and value.
• SAFE FOR KIDS – CERTIFIED NON-TOXIC AND FAMILY FRIENDLY: KomeStone rock tumblers enjoys the CPC certification (Children's Product Certificate) issued by the federal government, and made from non-toxic, child-safe materials, ensuring a fun and educational STEM learning experience parents can trust.
• DIVE INTO THE FUN ROCK TUMBLING: KomeStone rock tumbler turns rough rocks into smooth gemstones through a real 4-stage tumbling process. Kids love watching each cycle’s transformation—a great patience lesson—and adults enjoy using polished stones for jewelry making and DIY crafts.
• 2025 NEW UPGRADE & ADVANCED FEATURES: Elevate your tumbling with a built-in LCD screen, 9-day timer, 3-speed controls, and pause/resume function.
• 2.5 LB EXTRA LARGE CAPACITY & QUIETER: Our 100% soft rubber barrel absorbs impact for 75% quieter operation (similar to a dishwasher). The large-capacity design polishes 2.5× more rocks than standard 1 lb barrels—ideal for families, classrooms, and serious rock tumbling hobbyists.
• COMES WITH EVERYTHING YOU NEED: Includes tumbler, rubber barrel, 1 lb rough rocks, extra belts, 4 polishing grits, ceramic media, and an easy full-color guidebook—simple enough for any starter rock tumbler user to begin tumbling independently.
• SCIENCE-BACKED POLISHING FOR PRO-LEVEL RESULTS: Achieve museum-quality shine through our 4-stage grit system (60/120/150/1200) and precision ceramic media.
MPN: ROCKTUMBLER-K1-BLACK
UPC: 008678886865
Return Policy
At Retailking.com, we believe that in order to have the best possible online shopping experience, our customers should be 100% satisfied with their purchase. So, if you're not happy with your purchase for any reason, just contact us to obtain a return authorization.
Retailking.com 30 Day Zero Risk Return Policy
For the first 30 days after your purchase you may return merchandise for a full money back refund, excluding any shipping charges.
Returned or exchanged products must be in brand new, mint condition, and have all original manufacturer's packaging, materials, and accessories, including instruction booklets, packing inserts, and blank warranty cards.
Merchandise missing the original Universal Product Code (UPC) cannot be returned. The original manufacturer's labeled packaging should be enclosed within an outer shipping box. Please do not write or place shipping labels or stickers on the manufacturer's packaging.
If a product is received defective or incorrect, please contact us immediately and we will do whatever possible to resolve the issue. We will only cover return shipping if we are notified prior to return.
Simply follow these easy steps:
- Securely package item & double box if necessary
- You must include order number inside package
- Please ship item with tracking number
Items that qualified for free shipping that are being returned will have our shipping charges deducted from the refund or credit. The return shipping cost (the cost to send an item back to us) is not refundable.
Refund Policy
Returns
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
Gift cards
Downloadable software products
Some health and personal care items
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
Book with obvious signs of use
CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at support@mastertronics.com.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at support@mastertronics.com and send your item to: 4250 Northern Cross Blvd, Haltom City, TX 76117
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
To return your product, you should mail your product to: 4250 Northern Cross Blvd, Haltom City, TX 76117
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.