C1 Rock Tumbler Kit, 2.5LB Quiet Rotary Tumbler for Adults & Beginners

• Designed for Adults and Beginner Hobbyists – Turn rough rocks into polished gemstones with an easy-to-follow home tumbling system. The complete kit, simple controls and step-by-step guide make it easier to start your first batch while still offering enough capacity for an ongoing rock-polishing hobby.
• Large 2.5 lb Capacity with a Quieter Rubber Barrel – Polish more stones in each batch with a spacious 2.5 lb barrel—a practical step up from smaller 1 lb starter tumblers. Its thick rubber construction helps cushion rock impact and produces up to 75% less noise than typical plastic barrels for a more comfortable tumbling experience in garages, workshops and hobby spaces.
• Smart Controls with Pause, Resume and Memory – Choose from 3 speed settings and program each polishing stage with the clear 9-day digital timer. Pause the tumbler to check your rocks, then resume the batch without starting over. Automatic shutoff stops operation when the selected time ends, while the memory function restores your previous settings after a power interruption.
• Complete Kit for Your First Tumbling Batch – Includes a 2.5 lb rubber barrel, 1 lb of rough gemstones in 9 varieties, 4 polishing grits, ceramic tumbling media, a mesh strainer, jewelry findings, an illustrated step-by-step guide and 3 drive belts. The essential supplies for completing your first polishing journey and turning finished gems into keepsakes are included.
• Clear Guidance from Rough Rocks to Polished Gems – Follow the illustrated guide through each stage of the tumbling process. Each stage generally takes several days, and full results may take a few weeks depending on the rock type, size and desired shine. The tumbler is suitable for agate, jasper, quartz, aventurine, tiger’s eye，sea glass and similar hard stones.
• Replacement Belts and Responsive Customer Support – Three included drive belts help keep future tumbling batches moving, while replaceable components support continued use over time. The KoolStone support team is available to help with setup, operation, troubleshooting and replacement-part questions as you build experience with the hobby.
• Over 1,000,000 KoolStone Rock Tumblers Sold In The U.S. – Trusted by families and hobbyists across the country, KoolStone has helped make rock tumbling more approachable and enjoyable. The C1 combines simple controls, practical capacity and complete supplies to help new users begin tumbling with confidence. Based on internal KoolStone U.S. unit sales data through June 2026.
• Shop with confidence — we’re here to support your tumbling journey.

Specifications

• Age Range Description: Suitable for children aged 13 and above
• Set Name: C1 Rock Tumbler Kit
• Item Highlight: Complete Gem Polishing Kit with Rubber Barrel, 3 Speeds, 9-day Timer, Pause & Memory Function, and Included Tumbling Guide
• Unit Count: 1 Count
• Item Type Name: Rock Tumbler
• Manufacturer recommended age: 13 years and up
• Number of Players: 1
• Educational Objective: STEM
• Power Source: AC Adapter
• Supported Battery Types: No batteries required
• Operation Mode: Manual
• Number of Batteries: 1 AA batteries required.