Diamond Stones for Sharpening Ski Sides on Ice Snowboard Ski Sharpeners LPortable 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: DiamondColor: as shown in the pictureGranularity: 240, 360, 500, 1000Size Chart:Size S: approx. 30x20mm/1.18x0.79 inchSize L: approx. 70x25mm/2.76x0.98 inchThe package includes:4 Pieces Diamond Sharpening Stones