This plastic muzzle is made of polypropylene and features a nylon collar with a quick snap latch. Padding on the inside top of the muzzle provides cushioning. Three sizes available: Size 2 is 7" in circumference, Size 3 is 8" and Size 4 is 9". Sizes 1 and 2 have a solid end with a breathing hole and Size 3 features a double basket end.