Features： 1、FOR 3D PRINTER: Including 5pcs PTFE Tubings and 20pcs pneumatic fittings, suitable for 3D printer 1.75mm filament. 2、PTFE TUBE SPECIFICATION: The outer diameter of the blue PTFE tube is 4mm, the inner diameter is 2mm, with 2.15‑2.20g/cm³ density. 3、PC4-M6 SPECIFICATION: PC4‑M6 fittings have M6 (3mm) thread with 4mm ID (blue end) , and are suitable 4mm OD tubing. 4、PC4-M10 SPECIFICATION: PC4‑M10 fittings have M10 (6mm) thread, 4mm ID (black end), and are suitable for 4mm OD tubing. 5、 MATERIALS: The PC4‑M6 fitting is made of brass, and the PC4‑M10 fitting is made of stainless steel, sturdy and durable. Specification： Item Type: Pneumatic Fittings PTFE Tubing: Outer Diameter: Approx. 4mm / 0.16in Inner Diameter: Approx. 2mm / 0.08in Length: Approx. 1 meter / 3.3ft Density: 2.15-2.20g/cm³ PC4-M6 Fitting: Thread: M6 (3mm) Inner Diameter (Blue End): Approx. 4mm / 0.16in Material: Brass Suitable for tube with outer diameter of 4mm PC4-M10 Fitting: Thread: M10 (6mm) Inner Diameter (Black End): Approx. 4mm / 0.16in Suitable for tube with outer diameter of 4mm Material: Stainless Steel Application: Used for 3D printer 1.75mm filament Package List： 5 x PTFE Tubes 20 x Pneumatic Fittings