Package: 5PCS Hardened Steel + 5PCS Stainless Steel + 5PCS Brass High-Temperature nozzles, this kit contains total 15 PCS 0.4 mm nozzles in three materials.15 PCS Nozzles Kit: nozzles are made of high-quality materials, which has better thermal conductivity and high hardness for better printing.Smooth Inside: Smooth inner wall without burr, minor viscosity coefficient, smoother tapping. Cutting chamfer design, reducing resistance, smooth feeding, barely blocking.Compatible Models: These nozzles kit is compatible with Anycubic Koba, Mega X, Mega S, Mega, Kobra Neo, Kobra Go 3D Printers.Better Compatibility and Applicability: 3D extruder nozzles are compatible with most 1.75mm PLA ABS 3D printers with external M6 thread on the market.