This tank is high-quality aluminum construction, has thick, damage-resistant walls, new CGA320 valve, standard for CO2, DOT and TC certifications. 5.25" diameter and 17.9" tall including valve. Please Note: All aluminum CO2 cylinders are sourced from several manufacturers. As a result, the cylinder you receive may have a brushed dome or unfinished dome. We apologize, but we are unable to take special requests at this time.