Features and Benefits:•Works with airless, hot-air, and nitrogen plastic welders.No need to identify the plastic.Works with airless, hot-air, and nitrogen plastic welders.•Sticks really well to "problem plastics" like TPO and polypropylene.•Rod diameter fits perfectly into theFiberFlex 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 an airless 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.