Made of high quality polyurethane. Flexible shanks, includes curb chain. Thickness 1.5cm. Upper cheek bar: 4cm, lower 5cm. Flexible branches, included curb chain. The new rubber bits Waldhausen are made from food-safe thermoplastic polyurethane. Use a rubber bit solely for horses that tend to produce too much saliva. Thickness: 15 mm. Upper branch: 4 cm, Lower branch: 5 cm.