Polyurethane pipeline decoking pig with metal studs also called polyurethane pipeline decoking scraper from Yantai Zhengyuan Polyurethane Co.,Ltd. is a very important tool to  decoke the fired heater tubes and pipelines mechanically. Composed of high quality PU and some number of tungsten studs,They are of different designs,colors and sizes available for option.Also can be customized according to buyers' special requirements.They are very effective and efficient to clean the inner surface of pipes of different materials.