The 1. Quality Material - Our puppy collars are made of high density nylon, flexible, light and elegant. Silky, soft nylon won't ruffle your furry friend's feathers. It gives your pet the freedom to play. The different colors allow you to easily identify each of your puppies. 2. Size - available to fit puppies or cats. Measure your dog/cat's neck circumference before purchase. 3. Buckle -- If your puppy gets stuck, the buckle will loosen quickly under pressure. There is enough resistance in the tripping part, not easy to tripping. Your puppy's weight will break it, but it won't scratch it from scratch. 4.12 bone identification tags, the same colour as the collar, allow you to personalise your puppy. You can use the label stickers we provide or you can use a marker. These cute tags are practical and cool for your pets.