Bits and curbs made of AURIGAN® contain 85% copper and are guaranteed nickel-free. Many horses have nickel allergies which may cause the skin in and around the mouth to become red and sore. This newly developed metal, nickel-free AURIGAN®, can protect your horse's health. Many top riders already take advantage of Sprenger's AURIGAN bits. Snaffles and Weymouth bits made from AURIGAN encourage the horse's chewing activity unlike any other bit. These bits increase the horse's awareness and improve the contact between the rider's hand and the horse's mouth.