Mullen mouth bits are solid, curved mouthpieces that apply tongue and bar pressure to the horse's mouth. Large diameter mouthpieces are more gentle than smaller diameter mouthpieces. Mullen mouth bits are combined with western riding o ring bits, dee bits, short shank colt training bits, longer shank bits that add leverage when used with a curb chain. HorseLoverZ offers materials like sweet iron, copper, stainless steel from Darnall, Myler, Reinsman and more.