The Hogue AR15 M-16 Rubber Grip with Finger Grooves Grey features gentle palm swells that fit comfortably in your hand. The finger grooves naturally position fingers for an optimal grip. It features Hogue's famous cobblestone pattern texture for an efficient non-slip, non-irritating stippled grip. It is made from long lasting, durable, thermoplastic elastomer that ages gracefully for years of service. It is also impervious to all oils and solvents associated with firearms.