Year after year, ProMag has increasingly become one of the leading manufacturers of firearms magazines in the world. Gun enthusiasts and law enforcement personnel have agreed, be it for recreational "plinking", competition shooting, or law enforcement, Promag is the source you can count on. This is a magazine designed for SKS rifles and carbines. The springs are made from heat-treated chrome-silicon wire for increased reliability and smooth feeding. ProMag magazines include a lifetime guarantee, if you ever have a problem with their magazines; simply return them to ProMag for replacement. Specifications and Features:Manufacturer Number: SKS-A3ProMag SKS 7.62x39 Magazine 40 Rounds Polymer BlackCaliber: 7.62x39mmCapacity: 40 RoundsBody Material: DuPont Zytel Based PolymerSpring Material: Heat Treated Chrome-silicon WireFollower Material: DuPont Zytel Based PolymerFollower Color: BlackSprings are made from heat-treated Chrome-silicon wireFinish: Black