PFF60-720BLK is made using Black 95ShA durometer material. It has been designed to fill the voids in the OE mount for an effective and affordable solution to stiffening the original rubber. It fits 5-ribbed mounts only. A small increase in NVH, usually at idle, should be expected when stiffening the mount that isolates the engine/transmission from the chassis. The harder the material used, the greater the NVH transmitted.