This bit features an 18mm mouthpiece, designed for increased comfort for horses with larger tongues. The lozenge encourages a softer contact. Mouthpiece thickness: 18mm. Cheek height: 65mm. This bit is made from durable, tasteless, rust-proof, and easy-to-clean stainless steel. The loose rings allow for movement, helping to prevent the horse from leaning on the bit. Available in sizes 4.5", 5.0", 5.5", and 6.0".