Feature:1. COMPATIBLE: For Ender 3 S1, for Ender 3 S1 PRO, for CR10 Smart Pro, for Sermoon V1, for Sermoon V1 pro 3D printers.2. SIZE: Heating rod size Approx. 6x20mm/0.24x0.8in diameter, 24V 40W with terminals XH2.54, total length with terminals Approx. 73mm/2.9in, thermistor rod size Approx. 3x5.5mm/0.12x0.22in, NTC100K B3950.3. HIGH ACCURACY MACHINING: The seats is made of aluminum, the heat shielding is made of stainless steel, and all parts are machined with high accuracy.4. SMOOTHLY AND STABLE: Heater block has smoothly inner hole and outer surfaces, which makes the extrusion of material more smoothly and stable, and it can work up to 260C for a long time.5. EASY INSTALLATION: Replace broken, damaged, cracked or unusable extruder heater block, easy installation, won't take you too much time.Specification:Item Type: Extruder Standard Heater BlockMaterial: ABS, MetalScope of Application: For ENDER3 S1/Sermoon V1 Printer.Package List:1 xHeater Extruder Nozzle