B-91 is a additional Stone asked for by our World Cup technicians for SL in certain conditions
- B-91 is coarser than the B46 for more grip on icy conditions
- Used in SL on WC by some racers
- We consider it an additional stone for more grip on hard Injected snow
Compatible for use on Af-WC, Af-C, Af-L and Af-1 Snowglide machines