Jump'In French Mouth Blue Steel bit and copper elementsComposition: 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 with air and humidity, creating a thin layer of rust, which has a sweet taste that will naturally stimulate the