This is a Hogue Revolver Grip known as the Rubber Grip, model 25002.
Hogue's Conversion style Rubber Monogrip takes your S&W N Frame Round Butt to a Square Butt. This rubber grip is 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. The material does not come apart or deteriorate and is resistant to all solvents and oils used around firearms. Hogue grips give you a lasting precision fit and durability that will provide years of dependable service. This grip has proportioned finger grooves" a unique cobblestone texture and ambidextrous palm swell and is excellent for competition and concealed carry use. Fits S&W N Frame Round Butt Revolvers 29" 610" 625" 627" 629 and Magna Classic.
Features:
Fits S&W N Frame Round Butt Revolvers 29 610 625 627 629 and Magna Classic
Oil and solvent resistant
For competition and concealed carry use