National Geographic Rock Tumbler Grit & Polish Refill Kit – Tumbling Grit Media for Up to 20 lbs of Rocks | Compatible with All Rock Polishers

Keep your rock tumbling projects going with the National Geographic Rock Tumbler Grit and Polish Refill Kit. This complete 4-step grit media set includes coarse, medium, fine, and polish stages—everything you need to smooth and shine up to 20 lbs of rocks.

Perfect for beginners and experienced hobbyists, this refill kit works with any brand of rock tumbler and delivers professional-quality results. Whether you're polishing gemstones, crystals, or rough stones, this high-quality tumbling media ensures a smooth, glossy finish every time. Ideal for rock collectors, STEM learning, and geology enthusiasts.

• Complete 4-step grit + polish refill kit

• Polishes up to 20 lbs of rocks

• Compatible with all rock tumblers

• Includes coarse, medium, fine grit & polishing compound

• Professional-grade polishing results

• Ideal for gemstones, crystals & rough stones

• Great STEM activity for kids & adults

• Trusted quality from National Geographic