Snowglide replacement stone B91

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