The collar is made with sturdy printed polyester webbing and comes standard with a black buckle. The collar can also be made in martingale style with or without a buckle. Martingale collars have an extra loop which a leash attaches to, which allows the collar to tighten a certain amount, preventing the dog from slipping out of it. Please indicate the size you need in the order. Our sizing is as follows: X-Small: 8"-12" Small: 12"-15" Medium: 14"-18" Large: 17"-24" X-Large: 20"-29" XX-Large: 28-34"