The Reinsman Circle R Ported Bit combines one the most popular shanks of all time with a great mouthpiece to calm a nervous horse. An outstanding horse bit for a horse used to a leverage shank, the design gives more control than a normal medium port. The horse mouth bit also adds pressure to the bars and roof of the mouth to help break the horse over at the poll for better collection. These western horse bits offer a copper roller that has been shown to calm a nervous horse, especially one who likes to chew or play with the bit. Also, the copper aids in saliva production, creating a wet, soft mouth.