.45 ACP HD/+P, Full-Size; 8 Round Capacity, Aluminum Base Pad; Increases Reliability in ALL 1911 Pistols; Aircraft Grade Certified Stainless Steel Tube Resists Corrosion; 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; Observation Slots Moved to the Rear of the Tube, Located Exactly Where They Need to be to Maintain the Structural Integrity