Lightest Weight +5 for Glock 17/22/31 on the market 1.35oz aircraft grade CNC aluminum. Lowest Profile +5 on the market compact shape fits all magwells and holsters. Strongest and most reliable feeding spring the first and last round feed crisp and clean. True Grip most secure grip in the industry engineered for wet or bloody hands or gloves. Easiest and most reliable Installation clean simple and secure. Adds 5 additional rounds increases a standard capacity Glock Brand or Glock clone magazine