Hogue Rubber Grips, Finger Grooves and Right Hand Thumb Rest, Fits Ruger Mark IV, Black 79060 Hogue rubber grips are molded from a durable synthetic rubber that is not spongy or tacky" but gives that soft recoil-absorbing feel" without affecting accuracy. This modern rubber requires a completely different molding process than ordinary neoprene and results in a much superior grip. Precision fit for the Ruger Mark IV. Features a right hand thumb rest.