Full cheek blue steel blocked bitComposition: Effect: Blue Steel. The Blue Steel alloy used in this Jump'In range is made of 54% carbon and 46% manganese. Effeta full cheek bit has a direct action on the horse's mouth with no lever effect. This is the bit that will create the best frame possible and that is why it is perfectly adapted to young horses. The self blocking cannons articulate to a certain extent to keep some liberty while being sure of having a more important control if