Browning’s VCI (Vapor Corrosion Inhibitor) Gun Sock seals out moisture. VCI penetrates into the smallest crevices where oils cannot reach, driving out moisture. Provides full protection by forming a vapor enclosure around firearm from muzzle to butt. The VCI Sock, when used in a gun safe or cabinet, will offer additional protection to all metal items in the enclosed area. One size fits most firearms.