Features 1、Brass + PTFE: Made of high quality brass + PTFE material, which has good heat resistance, up to 260℃, safe and non toxic 2、Long Life: This is PTFE tube + pneumatic fitting kit, easy to install, convenient, fast, sturdy and durable, and has long service life 3、Application: This kit is small in size, simple and flexible in structure, used for 3D printer 1.75mm filament M6 feed connector 4、PTFE Tube: This is PTFE tube, which has outer diameter of 4mm, inner diameter of 2mm, and a length of 1m, which is easy to use 5、PC4-M6 Pneumatic Connector: This is pneumatic connector, the inner diameter (blue end) is 4mm, the thread is M6, 3mm Specification Item Type: Pneumatic PTFE Tubing Kit PTFE Tube: Material: PTFE Outer Diameter: Approx. 4mm / 0.16in Inner Diameter: Approx. 2mm / 0.08in Density: 2.15-2.20g/cm3 Color: White Heat Resistance: Up to 260°C Length: Approx. 1m / 3.28ft PC4-M6 Connector: Inner Diameter (Blue End): Approx. 4mm Thread: M6, Approx. 3mm / 0.12in Material: Brass Color: Gold+Blue Package List 2 x PTFE Tube 4 x Pneumatic Straight Connector