An adaptable bit, the lower ring produces more leverage if required. The mouth is made of many links making it difficult to lean against. Fit ¼? – ½? wider than usual as the mouthpiece needs to curl slightly around the lips for full potential. Sweet iron makes the bit very palatable and encourages salivation and softening. Mouthpiece thickness: 16mm. Cheek height: 145mm (4.5″-5″), 180mm (5.5″-6″).