The leads have a strong snap-bolt buckle. The length and weight of the snap bolt used for a lead is based on the lead width to ensure it is weight-appropriate for the size of dog using the lead. The leads also have a soft, fabric covered handle for less abrasion from pulling dogs. The leads are available in 4' and 6' and lengths. Each length is available in 1/2", 3/4" and 1" widths. The 1/2" and 3/4" leads have a lightweight polypropylene interior webbing and the 1" leads have a heavyweight polypropylene interior webbing.