Printing: PTFE head double-sided printing, can be used for fixing, anti-corrosion, and rust . Spare parts: you have any questions about the product, please us , and we will provide you with satisfactory service. Easy installation: and disassemble, tools required, the PTFE connector to the clone . 10/20/50PCS Bowden Connector PTFE Head Pneumatic Head for Clone Drive Extruder Upgrade Bowden Extruder 1.75mm Explanation: Good , and easy to use. First, press in the metal body components, and then gently press cover. Suitable for extruder