It provides reliability and smooth feeding. Constructed of steel with an electro plate finish these magazines will withstand the toughest corrosive environments. A hi-tensile compression spring, chrome follower and reinforced feed lips provide reliable feeding and long life. Technical Specifications Weight 0.4lbs Color Black Compatible with MP5 / SP89 / MP5SD Caliber 9x19mm Capacity 20 rounds Body Material Steel Spring Material Music Wire Finish Cation Electrodeposition Coating