The STAR roto handle is compatible with one STAR 70mm roto brushes or one STAR 1oomm roto brush. A transparent shield keeps the dust at bay. The STAR roto set-up is a great and unique option for a roto-brush set-up. The 70mL brushes are the perfect width for Nordic skis and pack more nicely in the wax box than a standard 100mm roto brush set.