Capacity: 30 rounds; For the Five-Seven pistol in 5.7x28mm; Injection molded housing and follower constructed of impact resistant, glass-filled nylon polymer; The spring is precision wound from heat-treated Chrome-silicon wire; Includes a molded grip-sleeve to fill the space between the bottom of the grip-frame and the magazine base-plate; Black Finish; Made in the U.S.A.; Limited Lifetime Warranty