Neck 14.5'-20', Width 3/4', Size Medium; The collar does not stretch itself, please make sure leave ONLY 2 fingers between collar and dog neck. A properly fitting collar and harness won't leave any room for your dog to chew. The collar is not for tie out. NEVER leave your dog unattended with a collar on. Made of high density polyester webbing and silver hardware. The ash grey buckles are made of eco-friendly plastic. All pictures are taken with our production samples from a size of Medium; Please measure your pets carefully for making the right purchase. Always look at the size chart for the recommended weight range to confirm the size.