French Mouth Blue Steel bit with copper ringsComposition: Blue Steel (54% carbon and 46% manganese) Effect: the bit has a direct action with no lever action and it prevents the roof of the mouth from any pressure thanks to the French Mouth characteristic. The Blue Steel alloy of this Jump'In bit collection is 54% carbon and 46% manganese. Blue Steel oxidizes when in contact of air and humidity creating a thin layer of rust which has a sweet taste that will naturally stimulate the production of