The most common materials used for insect screening material are aluminum, fiberglass, and in some cases PVC (for solar insect screens).
One key differentiator between types of Window Screen material is the MESH SIZE. You'll see dimensions like 18×16 mesh (standard); or other sizes like 18×14 (good for pool, patio & porch insect screening) and 20×20 (no-see-um screens). So for an 18x16 mesh, this means that within one square inch, there are 18 horizontal fibers and 16 vertical fibers.
All orders for window screens are custom made to your specifications.