Feature:1. SIZE INFORMATION: Extruder heater block kit is suitable for ENDER 3 S1, for S1 Pro printer, heating rod size is dia 6mm x 72.5mm, 24V 40W, with terminal XH2.54, total length with terminal about 73mm; Thermistor rod size is dia 3mm x 51mm, B3950, upgraded version, long working time up to 3002. EFFECTIVE INSULATION: The heating block is made of aluminum, the heat shield is made of Ti alloy TC4, and the wall are very smooth, providing excellent insulation between the heater and the cooling block. Ti is a very strong material with a thermal conductivity almost three times that of stainless steel, allowing for a more defined melting zone3. WITH THERMISTORS: The package include upgraded thermistors that can withstand long term, high temperature printing up to 300, improving the stability and reliability of the molding process4. BRASS NOZZLE: Possess smooth inner hole and outer surface, which is more smooth and stable for material extrusion, can be applied to all kinds of filament materials including PLA, TPU, PETG, ABS, etc. The maximum working temperature is 3005. BIMETAL HEATBREAK THROAT TUBE: Crafted from a combination of TC4 Ti alloy and copper, this innovative design effectively reduce upward heat transfer(7W/mK) while improving heat dissipation(400W/mK) for stable, excellent 3D printingSpecification:Item Type: Extruder Heater Block KitMaterial: ALuminum, brass, Ti alloy, siliconeBrass Nozzle Size: Approx. 0.4mm / 0.02inHeating Rod: 24V 40WHigh Temperature Thermistor Wire: 300Heating Rod Dia: Approx. 6mm / 0.24inHeating Rod Size: Approx. 72.5mm / 2.85inHeating Rod Total Length With Terminal: Approx. 73mm / 2.87inThermistor Rod Dia: Approx. 3mm / 0.12inThermistor Rod Size: 51mm / 2.01in.Package List:1 x 24V40W Heating Rod1 x High Temperature Resistant Thermistor Line1 x Aluminum Heating Block1 x Ti Alloy Copper Dual Metal Throat3 x Brass Nozzle 0.4MM1 x Black Silicone Cover2 x M2x14mm Inner Hex Screws2 x Inner Hex Top Threads1 x Small Screw