Diamond Stones for Sharpening Ski Sides on Ice Snowboard Ski Sharpeners L Portable 4-piece sharpening, ideal for removing excess burrs from, used for daily sharpening of skis or snowboards. 240 Grit (black): is used to remove surface hardening from damage caused by rocks. Granularity 360 (blue): Used for deburring the steel sides of skis and snowboards or for removing minor damage caused by rocks. 500 Grit (pink): It must have a smooth and sharp edge; it begins to bring out this high gloss. 1000 Grit (green): The ultimate diamond polishing when you are looking for that mirror finish; extremely accurate edge accuracy; used on skis and snowboards for a super smooth finish. Specifications: Material: Diamond Color: as shown in the picture Granularity: 240, 360, 500, 1000 Size Chart: Size S: approx. 30x20mm/1.18x0.79 inch Size L: approx. 70x25mm/2.76x0.98 inch The package includes: 4 Pieces Diamond Sharpening Stones