"Aluminium CO2 Cylinder � EMPTY Co2 plays an important role in keeping the plants life healthy. So get your CO2 cylinder ready for the greenary system! Lightweight, corrosion-resistant aluminum. Lightweight, corrosion-resistant aluminum Also, it ensures you get the best usage for a longer period. Features: Made of Aluminium. So not as heavy as steel tanks and doesn�t not rust. Shipped Empty Use with a regulator and refill timely. can be refilled anywhere in India Consistent weight It is very light as compared to iron/steel cylinder Its outlet is fitted wit cap so it does not leak during transportation Just refill it timely."