15 nozzle kits: The nozzle is made of high -quality materials. It has better thermal conductivity and high hardness, which can be better. Internal smoothness: The smooth inner wall without the burrs, the smaller viscosity coefficient, and smoother. Cut the chamfer design, reduce resistance, smooth feeding, almost no obstruction. Compatible models: These nozzle kits are compatible with for Any Koba, X, S, , Neo, Go 3D printer compatible. Better compatibility and applicability: The nozzle of the 3D extruder is compatible with for most 1.75mm PLA ABS 3D printers, and there is an external M6 line in the market. Material: Metal colour: As shown Package Contents: 5 x 0.4mm brass nozzles 5 x 0.4mm stainless steel nozzles 5 x 0.4mm hardened steel nozzles Only the above package content, other products are not included. Note: Light reflection 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.