Package Listing --- Miniature aluminum diving cylinder with 12 O rings and brass pick diving key chain. Two sizes O ring, each size has 6pcs, suitable for most cylinder valves. 3 Colors for Choice --- There are 3 different colors available, you can choose by your needs. Including 12pcs O rings of the package, meeting your different demands. Easy But Important --- This key chain may just save a very expensive dive trip, as O-rings are one of the most common items that need replacing. All accessories compactly store in the small scuba tank with a screw ring and can clip to any dive bag or keys Premium Material --- The Diving Cylinder Bottle made by high quality aluminum alloy material with natural rubber O-Ring, which is wear resistance and light weight, anti-corrosion and high strength. It's to use and can maintain a long service life. Guarantee --- Our product have 180 days warranty, if you have any question about this product, please feel to contact us, we will try our best to help you solve your problem., Weight: 0.06172943336 Pounds, Manufacturer: Keenso