The National Geographic Rock Tumbling Grit Bulk Pack contains over 3 pounds of rock polishing grit, compatible with any tumbler!

This Kit Includes:

• 4 Stages of Rock Polishing Grit
• 1 10 mL Grit Scoop
• Rock Tumbling Instructions

This four-stage silicon carbide grit for rock tumbling systems is the ideal way to give rough rocks a smooth, polished look. The first rock polishing stage smooths rough edges and provides initial shaping. The second stage smooths the rock surfaces even more. The third stage provides a strong pre-polish, followed by the fourth stage which completes the grit polishing process.

The 10 mL scoop in the grit refill kit ensures accurate grit measurements for every stage, allowing you maximize your grit usage for up to 20 pounds of rocks!

This rock tumbling grit refill pack is compatible with any tumbler on the market, but for best results, use with National Geographic tumblers and rock tumbling supplies, including ceramic media and GemFoam.

We make the highest quality hands-on science toys, and all products are backed by exceptional service. With a mission to inspire people to care about the planet, the National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.