The sleeves on the outer edges of this mouthpiece cover the ring junctions, preventing the pinching that can sometimes occur with loose ring bits, especially on horses with fleshy lips. Loose ring cheeks can help discourage binding and tipping because they are much more mobile than fixed cheek bits. The single jointed mouthpiece creates a nutcracker action and works on the lips and bars of the mouth, which, combined with loose ring cheeks, makes it an ideal choice for horses that tend to lean.Made of stainless steel, the most commonly used material for horse bits, it is durable, easy to clean, tasteless and will not rust.MeasurementsAccording to our size guide, the A and B measurements of this bit are as follows:A=15mmB=65mmStainless Steel Horse Bits...Stainless steel is the most commonly used material for horse bits because it is durable, easy to clean and does not rust. Some of our stainless steel bits have copper mouthpieces that help create a warm feeling and encourage the horse to...