AJR Sport TeffleX Roller D BitPremium design & craftsmanship in the AJR Sport Bit Collection. The TeffleX Roller D bit from AJR Sport is made from durable Teflon material with a light textured pattern. The rolling action gently stimulates the horse's jaw, encouraging relaxation and discouraging the tendency to lean on the bit. The unique texture on the roller creates a tactile element different from traditional rollers, helping the horse maintain a lighter, more responsive