This is a very mild bit as the pressure is distributed evenly through the mouth. Ideal for horses with small or soft mouths. Can be used with double reins or pelham roundings. Mouthpiece thickness: 14mm. Cheek height: 115mm (4.5"), 130mm (5", 5.5"), 140mm (6"). Stainless steel is the most common material for bits. Durable, easy to clean, tasteless and does not rust.