Reinsman Medium Loose Ring Twisted Wire Dog Bone- 3" rings, 5" mouth. 3/8" twisted wire mouthpiece. 
 
"Medium rings. Excellent bit for schooling or training your horse. It is excellent for young horses that get heavy or lean on the bit. This bit will lighten them up and bring them back off the bit. Mullen relief mouthpiece creates even pressure across the bars and tongue to eliminate nutcracker effect."