Neck 12"-16", Width 5/8", Size 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 (B01NAIB7BD) sold separately
Since the 3M reflective threads are stitched into the nylon webbing, it is normal to see that the reflective strings are frayed with the stiches where two layers of webbing are connected. The durability of this collar will not be affected. Please note that the 3M reflective threads are stitched into the webbing on one side only.
Those buckles are made from ecofriendly plastic. The metal D ring is black coated to add durability.