Pure Energy, 12 OZ Refillable CO2 Tank, Lightweight DOT & TC Certified Aluminum Cylinders, Reliable Pure Energy, Repeater Style Pin Valve, Installed By Qualified Technicians & Meet Or Exceed All Industry Standards, 5 Year Retest Cycle, All Components Meet Or Exceed All ASTM, DOT, TC , Or CGA Standards Or Requirements. Blister Pack.