The packaging contains polytetrafluoroethylene pipes with an outer diameter of 4mm, an inner diameter of 2mm and a length of 2m.2-thread M63mm, inner diameter (blue end) 4mm, 2-thread M10.6mm, inner diameter (black end) 4mm. ??Material??Made of high quality PTFE (polytetrafluoroethylene) material, it is safe and non-toxic, heat resistant up to 280??C. It is made of high quality stainless steel and plastic, with high hardness, oxidation resistance and corrosion resistance. ????Installation??Easy installation thanks to the external thread connection of the quick coupling.The extruder tube can accommodate all strong acids, oxidizers, reducing agents and various organic solvents except molten alkali metals. ?? Transparent 3D printing tube, non-toxic and odorless, harmless to human body and environment, with minimal error space between extruder and mold. ??Non-flammable??PTFE tube 3D printers do not burn in the air, which improves safety.Fine threads can be smoothly loaded into the hotend, designed for the highest temperature on the market, making it very suitable for printing strange threads such as ABS, nylon and polycarbonate.