Essex Designed Pad Tension Kit for AP Racing CP9660/CP9661 Caliper PairThe Essex Designed Pad Tension Kit for the AP Racing CP9660 and CP9661 Caliper substantially reduces pad movement inside the caliper. Each caliper requires one Pad Tension Kit. This is for 2 kits. Essex Designed Pad Tension Blocks are precision machined from billet aluminum, hard anodized, and topped with a heat treated stainless steel spring. These blocks install in place of the original pad retention blocks in AP Racing's CP9660 and CP9661 caliper.