Description: Package Included- This package comes with 1x Scuba Diving Donut Wing and 1x Scuba Diving Back Plate. Durable Material- Scuba Diving Donut Wing: TPU & 1050D Cordura & ABS & Rubber; Scuba Diving Back Plate: Aluminum Alloy. Designed for Diving- Scuba Diving Donut Wing is designed for snorkel diving buoyancy compensation, and Scuba Diving Back Plate is designed for single tank diving. Easy to Use- Removable soft bracket, slots and holes design make it very easy and convenient to use. Fits for Universal- Great Scuba Dive Tech Equipment for Scuba Diving & Snorkeling. Specification: 30lbs Diving Donut Wing Single Tank: Material： Inner Shell: 420D TPU Coated Cloth, Outer Shell: 1050D Cordura, Connector: TPU, Safety Valve: ABS, Air Eye：Copper Nickel Plated, Colorectal Tube: Rubber Color: Black Size: Approx. Donut(L x W): 64 x 43cm/25.2 x 16.93inch; Low Pressure Hose Length: 55cm/21.65inch; Rubber Colorectal; Tube Length: 30cm/11.81inch; Threading Slot(L x W): 13 x 0.7cm/5.12 x 0.28inch Schuba Diving Back Plate: Material: Aluminum Alloy Color: Black Size : Approx. L x W: 39.5x 26cm/15.6 x 10.2inch Thickness: 3mm/0.12inch Package Includes: 1 Piece 30lbs Diving Donut Wing Single Tank 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.