The bevel bit allows mild leverage and offers a little more control, promoting outline, head carriage and responsiveness. The loose brass alloy discs in the centre can help to soothe a fussy tongued horse. Mouthpiece thickness: 15mm. Cheek height: 55mm (4.5, 5), 70mm (5.5). Blue sweet iron mouthpieces oxidise easily to create warmth with a sweet taste which helps with bit acceptance and encourages salivation. Please note the blue colour will fade with use. Stainless steel is used for the cheeks due to it being durable, easy to clean and resistance to rust.