The Loose Ring Snaffle Bit by Harry's Horse is made of stainless steel with a Sweet Iron mouthpiece. Sweet Iron develops surface rust through contact with moisture, which creates a sweet taste that stimulates saliva production. This can encourage better bit acceptance and more foaming. The deep blue color comes from brief heating and changes to brown-grey as it oxidizes. Mouthpiece thickness: 16 mm. Rings: 65 mm.