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 260°C 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.