the shock absorbers of this series are multi-layer stacked shock absorber: the interior structure is complicated: the required strength is extremely high and the maximum load of a single shock absorber can be as great as tens tons. the characteristic of the shock absorber is that the shock absorbing effect is much better than that of spring and segmental steel spring. it is able to make the equipment maintain a very good operation state for a long period of time. the shock absorbers are ,mainly used in various crushers, large dump trucks and heavy vehicles, etc. the warranty is 12 months , and we promise good price.