bowden tubing]the bowden tubes made from the pure , features good flexibility, abrasion resistance, resistance, more responsiveness, less retraction, more accurate prints, less slippage, wear, and tear on the extruder, and less clogging when printing chunky filaments [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 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 ABS 3D printer Material:Metal, brass, colour:Blue+gold Package Contents: 1 x 1M xs bowden tubing 2 x PC4-M6 pneumatic connector 2 x PC4-M10 pneumatic connector 1 x MK8 accessories 4 x 0.4mm nozzle 2 x blue accessories 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.