3 Pcs Gummy Rubber Abrasive Stone- Edge Grinding Rubber Block Stone- Soft Snowboard Gummy Stone- Snowboard Ski Stone for Removing Rust and Burrs (Blue 60 Grit, Green 120 Grit, Red 240 Grit). Easy to Use: Just friction with gummy rubber abrasive stone along the edge of the ski or board, the more friction the better.
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