High durability metal alloy construction 30 round capacity The high tension spring ensures reliable feeding that prevents jamming Polymer mag base bumper that helps cushion the magazine when it drops Warning: Extreme temperatures may cause this airsoft magazine to malfunction. Avoid exposing the magazine to temperatures above 140°F (60°C) or below -4°F (-20°C), as this could cause the plastic or other materials to become brittle and crack, which could result in the magazine failing to feed properly or causing damage to the airsoft gun. Always store the airsoft magazine in a cool, dry place, and never leave it exposed to direct sunlight or other sources of heat.