Description: Diving Donut Wing: 420D nylon inner bladder and 1050D Cordura Outer Shell, strong and durable. Donut-style wing allows easy movement of air side-to-side. 18lbs single tank provides great buoyancy control. Great scuba dive tech equipment, provides excellent buoyancy control while you are Scuba Diving & Snorkeling. Scuba Diving Back Plate: Heavy duty aluminum alloy scuba diving back plate, tough, high strength, strong , wear-resistant and durable. Perimeter side holes for mounting lights, tank bottles, lift bags and other accessories. Slots to accept directly threaded cam belt bands for single tank diving. Slots for crotch straps, universal fits 1" and 2" standard webbing. Great gear equipment for technical scuba diving and divers. Specification: Diving Donut Wing: MaterialInner Bladder: 420D Nylon; Outer Shell: 1050D Cordura Size: Approx. Donut(L x W): 60x37cm/23.6x14.6inch Low Pressure Hose Length: 61cm/24inch Air Hose Length: 35.6cm/14inch Bladder Capacity: 18 lbs. Scuba Diving Back Plate: Material: Aluminum Alloy Size (L x W): Approx. 39.5x 26 cm/15.6 x 10.2inch Thickness: Approx. 3mm Color: Black Package Includes: 1 Piece Diving Donut Wing 1 Piece Scuba Diving Back Plate Note: Please allow slight difference due to manual measurement. Color might be slightly different due to different displayers. Thanks for your understanding.