Features and Benefits:•Works with airless, hot-air, and nitrogen plastic welders.•Square edge profile resists curling during repair process.This Polypropylene flat strip measures 3/8" (9.5 mm) x 1/16" (1.6 mm). Black pigment has been added so it will create a more invisible repair on black polypropylene parts. This rod is cut to 1 foot (30 cm) lengths and sold by the pound (0.45 kg). 1 pound contains approximately 115 feet.