ITEMS INCLUDED – (2) Refillable Empty 1/2LB Propane Tanks, (2) Caps, and (2) Allen Keys - 2mm (5/64") in size PERFECT SIZE for small propane lamps, lanterns, camp stoves, cooking torches, and welding torches SAVE MONEY, REDUCE WASTE: Stop wasting money on disposable tanks and start saving money with our reusable, safely, and easily refillable propane cylinders; Keep disposable propane tanks out of the environment by using the Flame King 1/2Lb refillable cylinders HIGH GRADE STEEL CONSTRUCTION: X-ray & Hydrostatic tested - powder coated for long-lasting exterior protection - DOT & TC certified for 12 years (10 years in Canada) - UL1769 listed SAFE TO USE - Flame King refillable propane tanks are the only 1/2LB tanks Certified by the DOT as legally and lawfully refillable and transportable. It is not safe or legal to refill and transport disposable 1/2LB tanks