E.T.S. magazines are made from advanced polymers that provide extreme impact resistance so they wont crack or break when dropped. With superior tempearture tolerances our magazines wont become brittle over time, even when exposed to harsh environments, chemicals, or extreme cold. Its durable construction eliminates creep so the feed lips and body wont spread when being stored long term, even when fully loaded. Translucent body allows you to see your ammo count and type.