The monogrips made from nylon are a Hogue exclusive. In addition to the advantages of the monogrip unique features of a nylon grip are high strength and durability and the property of being able to be worked like wood allowing a user to customize their own grip. This model has a black finish and is compatible with S&W J frame with round butt 30 32 33 34 36 37 38 43 49 50 51 60 63 317 331 337 351PD 360 431PD 631 637 638 649 650 651.