Composite cylinders are much ligher than the steel ones. It is approximately 50 percent lighter than the steel ones. This will greatly help reducing the mileage. It is also very safe. Composite cylinders do not explode in the fire. This is our great advantage because steel cylinders are known to be very dangerous. Composite cylinders are also transparent. This may not be so convinient for the automobile application since there is gauge to indicate, but ones would be able to check their gas level without even running the car. 

Composite Cylinder