B-40 is a new additional Stone asked for by our World Cup technicians
- B-40 is slightly finer finish than the stock B46 medium stone
- Used in GS on WC by some racers
- We consider it an additional stone for a bit less grip than B-46
- If looking to replace stock B46 we recommend replacement with B-46 and not the B-40
Compatible for use on Af-C, Af-L and Af-1 Snowglide machines