FiberFlex is Polyvance's "Universal" rod. It is not a true fusion weld, though. Instead, the FiberFlex is a hot-melt adhesive that is applied with a plastic welder. So, it is similar to a brazing process. It sticks great to polypropylene and TPO. This package contains 30 ft. (9.14 m) of FiberFlex rod. Each rod is 12 inches (30 cm) long and is 3/16th inch (4.76 mm) in diameter. There are approximately 94 rods in 1 pound (0.45 kg).