This is a combination multi-rate, and linear spring set for the HPI Savage XS, or Axial's Warith or Ridgecrest shocks
Spring steel construction
Linear-Rate springs allow for a more predictable linear dampening
Multi-Rate (dual-rate) springs allow the optimum spring rate for each application. These multi-rate springs are soft at the beginning to soak up the small bumps, but transitions to the stiff part of the rate to resist bottoming out on jumps and other big "hits. "