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Jernon, the Polymer is the material that the lower Frame is made of which is a durable type of plastic such as is on Glock Pistols. Cheers and stay safe! --------- Example : https://daytonatactical.com/products/80-compact-polymer80-glock-compatible-pistol-frame-kit

Polymer is what the frame is made of. It's pretty much just a stronger form of plastic. Hope this helps.