【Package Includes】You will receive 15pcs different colors puppy collars, red, light green, green, light blue, yellow, white, orange, brown, gray, fluorescent yellow, pink, purple, dark blue, black and fuchsia. You can use the color of the puppy identification collars to identify your pet. 【Material】The puppy indentification collars are made from nylon and polyester, Designed with hook and loop tape. The ID collars both sides with velvet. Fasten securely yet soft enough for newborn puppies, don't restrict their necks when moving. 【Adjustable Design】Each puppy collar is 9.25 inch/23.5 cm long and 0.39 inch/1 cm wide. You only need to put them on the neck of the puppy. The length is adjustable, so it will adjust easily as your puppies grow and stay on very well. 【Unique Design】Our pet collar has an adjustable hook and loop design to suit the size of each pet. Put puppy litter collars on the neck of your newborn puppies, so you can identify them with the collar’s bright color, making it easy for you to track your pet. 【Warm Tips】We advise you wait until the newborns are at least 5 days old before putting the collar on and make sure to check your pet's collar to see whether it's too loose or too tight. The collar can be cut off to fit your pet's neck. If you are worried that the dog/kitten will not like it, you can put the collar on the place where it often sleeps and plays, so that your pet can get familiar with it and like it as soon as possible.