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 polishing tasks. The 150 grit hard blue rubber abrasive stone is good for removing micro-burrs on the surface. Small Size: The Snowboard Gummy Stone measures 5x4x2 cm, lightweight and portable, easy to carry and store. Package Includes: 1 piece snowboard ski stone (optional: 60 grit, 120 grit, or 150 grit), choose according to your needs. Versatile Use: Besides being a great snowboard tuning tool for ski board maintenance, this rubber grinding block can also be used for hanrafts 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 Package Includes: 1 Piece Rubber Gummy Grinding Stone (as selected) Note: Please allow slight variations of 1-2 cm due to manual measurement.