Palantic Xtreme Donut Wing Single Tank with SS Backplate and Harness Basic Set This set includes: donut wing + simple harness + 2 tank belts + backplate pad + 2 butterfly screws Donut Wing Material: Outter Shell 1680-Denier Ballistic Nylon. Bladder: 420-Denier Nylon Stainless Steel Simple harness: Backplate size: 15-3/4" x 10", thickness 3mm, 2" nylon webbing, 5 SS D-rings Tank belt size: 37" x 2", non-slippery design. Backplate Pad: Comes with 8 bookscrews for you to install it on the SS backplate. Size: 14" x 11" Comes with 2 butterfly screws for you to install the SS backplate and the donut wing together