This mullen style bit is made of durable stainless steel with a copper mouthpiece to help promote salivation. The solid bar mouthpiece offers equal pressure across the tongue and bars of the mouth. The half cheek style helps with stability during turns when driving. A great choice for miniature horses who do not do well with jointed bits.The severity of a bit or hackamore is influenced by rein control of the rider and sensitivity of the horse. All riders should seek an equine professional that they trust when selecting a new bit, as every horse's needs are unique.