Swix Sport brushes are designed for brushing wax out of the structures (base patterns) in ski bases and snowboards after scraping. Should be used in one direction, from tip to tail. Special brushes are also used before waxing to clean and open base for better wax absorption. The Swix Wild Boar Brush is 0.15 mm. It is the second brush on Cera F. Use 5 to 10 strokes.