The Benjamin Charging Cylinder is constructed of durable carbon fiber and is rated for 4500 psi, perfect for use with PCP air rifles or air pistols. The Cylinder comes with a stainless steel fill connection, 12-inch microbore hose, grippy hand wheel for controlled filling, built-in pressure gauge and bleed valve. At under five pounds and 15-inches in length, this 4-inch diameter tank fits nicely in a pack for a day in the field.