.45 ACP HD/+P, Full-Size; 8 Round Capacity, Lo-Profile Steel Base Pad; Increases Reliability in ALL 1911 Pistols; Maximum strength-up to 25% stronger than standard 1911 mag springs for superior reliability with defensive and +P loads and more positive slide lockback; Maximum longevity MAX flatwire spring will never lose optimum feeding tension as long as you own the magazine -guaranteed! Extensively tested by the Wilson Combat Shooting Team and testfire crew.; The ETM has the Strongest Magazine Tube Yet Developed, Virtually Eliminating Feed Lip Cracking, Tube Spread and Cracking and General Fatigue; Refined Radius for Each Bend in the Tube to Take Advantage of the Strength in the Stainless Steel; Proprietary, Custom Designed Welding Process; Proprietary Multi-Step Tumbling and Finishing Process Provides Smooth Follower Operation and Insertion into the Weapon; Black models are finished in black nitride QPQ finish-Theultimate in a wear resistant, non-reflective finish. Black nitride QPQ will not chip, crack or peel. This surface treatment is the toughest black finish wecould find for our world renowned 1911 magazines.