Made from extremely strong, lightweight nylon reinforced polymer High tension steel spring for enhanced reliability and improved feeding Works great with high rate of fire AEG's Ninja-stealth, quiet operation with no rattling High grip texture with ribbed front for a positive secure grip during mag changes Windowed with simulated rounds Easy maintenance The 30 round "realistic capacity" magazines are made available for the training and Milsim type gaming looking for true realism. The 190 round capacity version of this magazine is also available. The Evike.com BAMF magazine features a robust construction, performance, light weight, a slick and simple overall appearance, and ninja quiet stealth operation.