About this project [Suitable for small dogs, medium dogs and cats] The length of the dog collar is 20.4 inches, but with multiple holes in the strap, you can adjust it between 3.1-6.2 inches to fit your pet. We recommend you use it on cats, small and medium dogs. Note that it is not suitable for small, skinny cats. [How to Assemble] Measure around the base of your pet's neck and place a finger between its neck and the tape. Cut excess tape to fit around pet's neck. [The dog and cat collars are fully compatible with the aviation tag. By securing the collar with this air tag, you can keep track of cats and dogs while they're hiding somewhere in the house. Never lose your pet with this small air tag dog/cat collar. [Comfortable and Durable] This dog and cat collar is made of soft silicone, non-toxic, comfortable, sweat-proof, scratch-resistant and washable. [Product size: 52*4*1cm/20.4*1.5*0.3 inches Item NO.310731846