This is a Hogue Rubber known as the HandAll Universal, model 17110.
Featuring gentle palm swells" naturally positioned finger grooves and Hogue's famous Cobblestone(TM) texture" Hogue HandALL(R) grip sleeves provide unparalleled comfort and increased recoil absorption. Hogue HandALL grip sleeves have been engineered for a precision fit to polymer-framed pistols" and are crafted from a long lasting durable elastomer that ages gracefully for years of service.
Features:
Made for smaller, compact firearms that have a grip frame with a primarily straight back strap
Fits:
• AMT: Baby Automag
• AR-15: Stock grips without finger grooves
• Beretta: 84FS Cheetah, 85FS Cheetah, Model 86, Model 87, U22 Neos, Neos Inox
• Bersa: Thunder 380 Plus, 85
• Chiappa: Rhino
• Colt: Targetsman, Challenger, Match Target, Woodsman