Features: Ensure underwater safety with our underwater scubas diving tanks, designs to provide immediate oxygen support when you need it most. Craft from 6061 aviation aluminum, this 0.5L underwater emergency backup cylinder is light weight and easy to carry, making it perfect for short durations dives. With its compacts designs and strong construction, this backup cylinder is a must having addition to your underwater gear collection, ensuring safe on every underwater adventure. Perfect for use during scubas diving, snorkeling, swimming, and other underwater activity where emergency oxygen supply might be required. Ideal for diving enthusiasts, ocean explorers, and water sports beginner seek safe emergency oxygen solution. Specifications: Materials: 6061 Aviation Aluminum Color: Green/Black/Tangerine Color Styles Optional: 2 Styles is Available as Shown in the Picture. Size: As The Picture Shows Capacity: 0.5L Package Includes: 1Pc Diving Tanks note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!