Edelbrock Nitrous Bottles are D.O.T. approved aluminum or carbon fiber. They are available in three sizes to suit your needs, aluminum bottles are powder coated silver or polished and come with a CGA approved valve with a built-in siphon tube. They also include a pressure/temperature venting system in case your bottle is overfilled or if pressure increases beyond the safety level. Note: All nitrous bottles are shipped empty. 10 lb. aluminum bottle, powder-coated silver (350-72300) shown.