Fiberglass rods are primarily composed of finely woven glass fibers, which are then infused with a resin, usually epoxy or polyester. The manufacturing process involves pulling glass strands through a resin bath and then curing the mixture, resulting in a solid, rod-like structure. The primary advantage of fiberglass over traditional materials such as metal or wood is its resistance to environmental degradation. Unlike metal, fiberglass does not rust, and compared to wood, it is impervious to rot and insects.