This set includes: 40lbs donut wing + deluxe harness + 2 butterfly screws + tank belt + SS double tank holder;Donut Wing Material: Outter Shell 1680-Denier Ballistic Nylon. Bladder: 420-Denier Nylon;Stainless Steel Deluxe harness: 3-piece complete harness system with adjustable shoulder strap;Comes with 2 butterfly screws for you to install the SS backplate and the donut wing together;Tank belt size: 37 x 2, non-slippery design