Belltech BUMP STOP KIT REP. FOR 00-06 GM SUV REARBelltech Bump stops are designed to complement any suspension kit. The microcell elastomer polymer foam bump stops provide a progressive rated pad to reduce harsh bottoming in case of a severe overload. Acting as a secondary spring, Belltech's microcell elastomer polymer bump stops progressively increase in rate as they are compressed which offers a much improved feel during engagement over traditional solid polyurethane bump stops. Sold in pairs.