Rubber spring: It 's a kind of polymeric elastomer with efficient anti-vibration, small resonance region, it would be your best choice.

Concussion spring is rigid and flexible. It is the elastic anti-vibration device converting the kinetic energy into the heat energy and then lost. It can be used in the vibrating equipment, power car, car and so on. Comparing with the steel spring it has the obvious strong points of good stability, low noise, efficient vibration isolation and long lifetime. There are two kinds of concussion spring, one is rubber spring and the other is the composite spring.

Composite Spring: It is a cylinder-shaped elastomer body compound by the metal coil spring and rubber. This spring is superior to metal spring, because it has good corrosion resistance, long life, better damping ability and cushioning effect.