Material: CHT hardened nozzles are made of high-quality stainless Steel. The nozzle is not easy to stick filament with high hardness, resistant to wear and tear. Size: 0.4MM stainless steel nozzles with 1.75mm PLA/ABS/PETG/TPU/Wood filament. Compatible Printer: Our nozzles are compatible with I3 /S/X/Pro, Neo/Go,for Prusa I3 MK3/MK4 3D printer. High Speed: It's a special stainless steel design so the print head heats evenly. The interior of the nozzle is smooth without burry, which not only reduces air resistance and prevents the filament from jamming, but supports high-speed printing. Note: Slight color difference or discrepancy in kind, does not affect use Colour:Black Material:Hardened Steel Package Contents: 6x Thread Hardened 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.