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. Diving Waist Belt: Durable nylon diving weight belt webbing strap attachment 3.5m/138inch long, but you can DIY strapping backplates. Easy and convenient to use. Strong, lightweight, anti-corrosion, durable and portable. Great for technical diving backplates,scuba diving, snorkeling, free diving and so on. 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. Diving Waist Belt: Material: PP webbing Size:Length: 3.5m/ 138inch, width: 5cm/2inch Color:Black Package Includes: 1 Piece Diving Donut Wing 1 Piece Diving Weight Belt Webbing Note: Please allow slight difference due to manual measurement. Color might be slightly different due to different displayers. Thanks for your understanding.