product description Material: metal iron + polyester Recommended size: length 35cm, suitable for small dogs Length 50 Length 55cm suitable for medium and large dogs Length 60cm is suitable for large dogs Features: Sharpened dog spines around the head, Velcro strap protection adds to the overall look, makes the product look more advanced, slows surface friction and delays rusting. Dog training collars can help you teach your dog obedience and basic commands. .You just pull on the training collar and the dog will stop being naughty immediately. The ring is effective and safe and will not electrify or harm your pet. , while ensuring that your pet has significantly less traction as you walk. Made of high-quality stainless steel, this collar is built to last. In addition, this unique collar features a specially designed quick release buckle to easily secure and remove your dog's leash Give your dog a secure and comfortable application and your life will become better.