About this project Rich Colors: 15 colors of pup collars, which are easier to distinguish and enough to meet your needs. You can also write your pet's name on it with a pen COMFORTABLE SOFT: Double-sided soft nylon provides gentler care for the pup's delicate skin. More comfortable and less scratching than single sided DURABLE AND RELIABLE: Our pet pup collars feature double nylon fabric and double stitching technology, while providing more reliable zipper straps, you never have to worry about them falling off or tearing, ensuring long-term use ADJUSTABLE: Each pup ID strap has a zipper at the end, making it easier to fit fast growing puppy pets. Also suitable for other small pets, such as kittens, puppies, etc. NOTE: Please don't be too tight, your puppy is growing fast, please check that the Velcro is pressed firmly into place to make sure the id strap is well secured. Product size: length 35cm/13.7 inches, inner diameter is about 10cm/3.9 inches