CarBole 4500 PSI Heavy Duty Pistol Grip Style Grease Gun Heavy duty aluminum anodized canister. Cartridge: Standard(14 oz);Maximum Pressure: 4500 P.S.I. ; Barrel: Aluminum . Includes a 12" flex hose and a 5-1/2" metal extension with coupler, can pump out the grease in 3 Modes A rubber sleeve on the barrel provides added grip in slippery situations. The aluminum barrel saves weight over traditional steel models, while the pistol grip actuator creates plenty of leverage for all day comfort.