Designed to be ultimate carbon fiber air system, the First Strike Hero 77 Carbon Fiber tank features a massive 77 cubic inch 4,500psi capacity for plenty of shots, a tool-free rotational regulator for the perfect fit attached to any airsoft gun, a lifetime-use bottle with 5 year hydro date and adjustable output pressure from the nickel-plated brass regulator. Light, versatile and packed with features, this First Strike air tank is an outstanding choice for the serious player!