The loose ring cheeks can discourage fixing and leaning as it has much more movement than a fixed cheek. The shaped lozenge offers even pressure and encourages mouthing and contact. Mouthpiece thickness: 15mm. Cheek height: 65mm. Blue sweet iron mouthpieces oxidize easily to create warmth with a sweet taste which helps with bit acceptance and encourages salivation. Please note the blue color will fade with use. Stainless steel is used for the cheeks due to it being durable, easy to clean, and resistance to rust.