if your printing temperature is over 300℃, please remove the silicone sock before printing [Plated Titanium Alloy Heatbreak Throat Tube]Using High-quality materials processing, titanium alloy has good thermal insulation, can reduce the heat conduction upward. For a long time of printing has an obvious role in improving the quality of printing. [Nickel Copper plated nozzle 0.4mm]It has smooth inner hole and outer surface, which is more smooth and stable for material extrusion. It can be applied to all kinds of materials. The maximum working temperature is 500° [Nickel plated copper Heater block]Copper has more than 3x the thermal conductivity of brass, and the copper alloy we use has been hardened and treated to reduce the oxidation that occurs in copper at high temperatures. The higher thermal conductivity also slightly increase your heat-up times, and provide highter temperature control, Reach up to 500°C, making it perfect for the high-temperature printing. Material: Metal colour: As Shown Package Contents: 1 x Titanium alloy pipe 1 x Heating block 4 x Silicone sleeve 6 x Nozzle 2 x Screws 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.