This Rear Lower Shock Shin Guard is made out of 304 Stainless Steel. This guard prevents your rear shocks from dragging on rocks and other obstacles while on your offroad adventures. The "Shin Guard" design helps prevent debris from prematurley wearing your shock's shaft which will prolong the shocks life. Stainless Steel was our first choice for this piece because it is exposed to the elements and road debris more than any other part of the rear suspension. The hardened stainless will prevent corrsion and will not gouge like common steel skids.