Rugged EPDM rubber hose retainer band resists rolling and tearing and has the right amount of stretch. A large webbing loop on the retainer is easy to grip even with gloves on. Marine grade stainless steel cylinder clamps and hardware are saltwater ready and resistant to corrosion. A 5/8 inch piece of tubular webbing cover the tank clamp and screw for abrasion protection. A longer piece of black plastic tubing slides over the nylon webbing to form a comfortable handle on the carrying strap. Assembled as a kit, divers have a choice between 7 inch diameter cylinders or 5 inch diameter cylinders. Both come with XL stainless bolt snaps.