Features 1、[Enhance Printing Performance] This hotend heater block kit is designed for Prusa MK4 3D printer, can elevate your 3D printing capabilities. 2、[Rapid Heating] This aluminum heater block kit allows for quickly achieving the desired temperature during the printing process, enhancing printing efficiency. 3、[Reliable Replacement] Our thermistor is an ideal replacement for damaged thermistors, can be securely connected to the circuit board connector. 4、[Anti Interference] This kit has excellent anti interference performance, ensuring stability and reliability, resulting in consistent performance. 5、[Ideal Replacement Part] Replace old or damaged components with this heater block kit, finely crafted and attention to detail. Specification Item Type: Hotend Heater Block Kit Material: Aluminum Alloy Heating Rod: Approx. 6x12mm / 0.24x0.47in, 24V 40W, Cable Length: Approx. 120mm / 4.72in Thermistor: Approx. 3x8mm / 0.12x0.31in Aluminum Heating Block Size: Approx. 21x13x13mm / 0.83x0.51x0.51in Applicable: for Prusa MK4 Package List 1 x Heating Rod 1 x Thermistor 1 x Aluminum Heating Block 1 x Insulation Sleeve