Bit Made of Durable Stainless Steel Designed for Horse Comfort. The unique shape of the mouthpiece rests more easily in the mouth and extends beyond the lips for improved communication. Inlaid copper bands and a copper center roller promote salivation. Brass fittings provide resistance-free action on the tongue, bars, and lips. Long stems offer increased leverage. Adding a curb chain to this bit can help increase speed, assessment, and stopping power. Features: Fits mouths 4.5″ to 5.5″; 0.25″ mouthpiece diameter with a 0.75″ copper center roller and 5″ stem