It's a smart solution to protect your dog's deworming collars. In addition to aesthetically improving its appearance, when placed on the inside of the collar, it not only becomes safer, but also helps better protection against external elements, such as direct contact with other animals or humans, especially children. The measures indicated for the collars correspond to the perimeter of the dog's neck. Size S (23 to 31cm), M (29 to 42cm), M/L (33 to 50cm), L (39 to 60cm), XL (48 to 80cm) Hardware Gold (bronze), Silver (steel), Silver (nickel), Black (chrome nickel) The Collars are produced in washable Nylon, easy to dry and of high strength. The fittings made of bronze alloy, do not oxidize in contact with fresh water, resistant to salt water and sand, and functional even at negative temperatures. Do you want to pesonalize the collar? (with name or phone number) Yes, No