This Swix Steel Roto Brush is a high quality, steel brush is used to clean and open the base of your skis. Use this fine steel brush to clean the base structure of your skis prior to applying wax. It can also be used as a 2nd brush on wax after using a horsehair brush. *Swix recommends deburring the steel lightly with sandpaper before using for the first time on skis. 100mm.