Jump'in Double Jointed Blue Steel with Copper Rings Loose Ring BitWe love this bit because not only does the blue steel and copper help encourage the horse to salivate, but the copper rings also offer something to occupy busy mouthed horses. Features 90 mm rings and a double jointed,13mm thick mouthpiece made of Blue Steel with copper inlays. 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 production of saliva. By