Gas springs have a number of advantages over coil springs. 1. They can offer a much higher force in a smaller package than coil springs. 2. On compression they do not bounce back, and the extension rate can be controlled, giving a smooth return. 3. Typically gas springs have a low compression rate, but if required this can be increased. 4. With a wider range of end fittings available, gas springs can be easier to fit. 5. A wide range of additional features can also be offered.