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The extrusion is the actual molded form of the frames.  The AV-Drop extrusion is designed for maximum rigidity and minimum weight. It is also a manufacturing process used to create objects of a fixed cross-sectional profile. A material is pushed through a die of the desired cross-section. Allows for the creation of complex cross-sections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. It also forms parts with an excellent surface finish.