This is a muzzle for medium to large dogs. It hasn't been used much, but there is some rust from aging and dog hair that couldn't be removed. The largest circumference around the mouth is about 40cm. The tip of the muzzle is about 30cm. The strap from the tip of the muzzle is about 16cm-40cm. The neck strap is adjustable from about 40cm-70cm. Thank you.