Gun Sock VCI Beretta - Pistol The first gun sock designed for the transport and storage of firearms under wet field conditions. Unlike silicone-based gun socks, the Beretta VCI (Vapor Corrosion Inhibitor) gun sock does not trap moisture. Instead, it uses VCI technology to form a protective chemical barrier that stops rust and corrosion from occurring. This technology works so well, the sock is perfect for long-term storage. The sock is made of soft spun yarns that will not abrade metal finishes. Length: 13.5 inches. Model Number: SFOU66001A