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Hardened Steel The SIUTEC Neptune 4 premium nozzle is made of high quality hardened steel with a hardness of 7.8 (Mohs) for maximum durability. Compatibility: Specially designed for the Elegoo Neptune 4 & Neptune 4 Pro, with M6 thread and 1.75 mm filament diameter. HIGH TEMPERATURE RESISTANCE: Maximum printing temperature of 450°C and thermal conductivity of 22W/mK for reliable printing results. Versatile material compatibility: suitable for PLA, PLA+, ABS, TPU, PA and many other filaments; available in sizes 0.2 / 0.4 / 0.6 / 0.8 / 1.0 mm. Precision-made: Tight manufacturing tolerance of ±0.01 mm and compact dimensions of 18 x 6 mm ensure the highest print quality and a perfect fit.