Sophisticated Pup collars are made with designer fabrics and traditional black plastic buckle and stainless hardware. The nylon webbing core has a tensile strength of 2100 lbs., so they can withstand pulling by even the strongest of dogs. Our collars are machine washable. Our leashes are very strong, durable and stylish. Our leashes are made of a heavy nylon webbing, which provides for the best type of leash/collar construction. The nylon webbing is waterproof, retains it's shape, and has a tensile strength of 2100 lbs to resist the pulling of even the strongest of dogs. The stress points are stitched with a heavy-weight nylon thread, the same type of thread used to construct luggage. We sew our products on commercial grade equipment, the only kind of equipment that can handle threads and materials of that thickness. Don't be fooled by others that are sewing pet products on home sewing machines, they will not hold up. Not only are our leashes durable, but they are incredibly fashionable as well. They are double sided with designer fabric, unlike most fabric leashes on the market. Your pup will look stylish whether they are coming or going from the park! Leashes have a zinc die-cast snaphook. Leashes are available in 3/4 in and 1 in widths and a 5 ft. length. Sophisticated Pup products are handmade in Chicago, IL. This collection has a soft lining on the inside of the collar and the inside of the leash handle for extra comfort. Sizing Small 9"-13" (5/8" or 3/4" wide) Medium 13"-17" (3/4" wide) Large 17"-21" (1" wide) Leash 3/4" x 5' 1" x 5'