Shires Hollow Mouth Eggbutt Snaffle Bit has a fairly thick mouthpiece which makes this bit softer in the mouth. It is also hollow which means that it is very light. The Eggbutt provides a quieter action in the mouth which is ideal for horses who are unsure of the bit. This bit is made from stainless steel which is durable, easy to clean, tasteless and does not rust. Size Guide Available in 4.5", 5", 5.25", 5.5", 5.75", or 6.0". Mouthpiece thickness: 21 mm. Cheek height: 70 mm.