Reliable Material: Snowboard Gummy Stone is made from rubber material and can effectively remove rust and burrs. Fine to Coarse Optional: The 60-grit soft red rubber abrasive stone is suitable for removing rust and burrs; the 120-grit medium gray rubber abrasive stone is ideal for polishing light to medium edges and light cleanup; the 150-grit hard blue rubber abrasive stone is good for removing micro-burrs on the surface. Compact Size: The snowboard gummy stone measures 5 x 4 x 2 cm, lightweight and portable, easy to carry and store. Package Includes: 1 piece snowboard ski stone (choose 60-grit, 120-grit, or 150-grit option as needed). Versatile Use: Besides being a great snowboard tuning tool for ski board maintenance, this rubber grinding block can also be used for crafts or other items requiring delicate sanding or polishing tasks. Specifications: Material: Rubber Size: 150-grit hard blue rubber abrasive stone: 5 cm x 4 cm x 2 cm (1.97 x 1.57 x 0.79 inches) Package Includes: 1 piece rubber gummy grinding stone (as selected) Note: Slight variations of 12 cm may occur due to manual measurement.