Neck 8"-11", Width 3/8",Size X-Small; 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.This collar is a single product. Its matching leash (B06XKB3KNG) /harness (B06WLLPSKT) /lanyard (B075K69412) sold separatelyMade of high density polyester, which imparts softness and durability to the product. The buckles are made of eco-friendly plastic. Made with nickel-free coated D-ring to add durability.All pictures are taken with our production samples from a size of Medium (Width 3/4", Neck 14.5-20"). Please measure your pets carefully to make a safe and fit purchase. Always look at the size chart for the recommended weight range to confirm the size.