SKS Brass-Horsehair Roto Brush for Skis 100 mm Ski Roto-Brush Brass-Horsehair 100mm Brush. For first brushing, especially for cold/hard wax, to free wax from base structure; or post race fast cleaning of the base. Use shield or wear appropriate eye protection. Fits on these axles: Swix/Toko/Red Creek.