[ bowden tubing]the bowden tubes made from the pure PTFE, features good flexibility, abrasion resistance, chemical resistance, more responsiveness, less retraction, more accurate prints, less slippage, wear, and tear on the extruder, and less clogging when printing chunky filaments [PTFE cutter with extra pointed ]the tube cutter can cut flat on both sides to prevent any malfunctions or heat creep when feeding and retracting [Practical durable parts]PC4-M6 Couplers: thread M6/3mm, inner diameter 4mm, made of copper and plastic, sturdy and durable; PC4-M10 Couplers: thread M10/6mm, inner diameter 4mm, made of quality stainless steel and plastic, high hardness, antioxidtion, anti corrosion [Compatibility]teamed up to put the quality products together for beginners all the way to experienced hobbyists; This kit is designed to give improved performance possible without a complicated installation or alterations to the printer itself; Compatible with 1.75mm PLA ABS 3D printer Colour:blue black Material:Metal, brass, PTFE Package Contents: 1 * 1M xs bowden tubing 1 * PTFE tube cutter 2 * PC4-M6 pneumatic fittings 2 * PC4-M10 pneumatic fittings 2 * MK8 socks 2 * 0.4 mm nozzles Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.