Made with quality built in, the Greg Darnall Smooth Futurity Snaffle Bit features a mouthpiece of sweet iron which naturally rusts causing a sweet taste for your horse and ultimately encouraging the horse to accept the bit readily. The d-rings help in turns by putting pressure on the corners of the lips through turns. 7/16" diameter 5" smooth mouth, 3" rings. Greg makes a variety of bits that any horse and rider combination can use. His philosophy is that the bridle bit is one of the primary modes of communication between horse and rider. No two horses or riders are alike.