Portable 4pcs Sharpening stone set, great for Remove the excess burr from the base, use for a day to day sharpening of your or your snowboard. 240 Grit (Black): Use for removing case hardening from rock damage. 360 Grit (Blue): Use for deburring steel sides on skis and snowboards or for addressing minor rock damage. 500 Grit (Pink): A must have diamond to maintain a and sharp edge; starts to bring out that high polish shine. 1000 Grit (Green): Final diamond polish when looking for that mirror finish; extremely exact edge accuracy; used on and snowboard skis to achieve that super finish. Type: Sharpening Stone Set Colour: as shown Material: diamond Package Contents: 1 Set * Sharpening Stone Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.