Features： 1、Smart Heating: The cartridge heater ensures quick heat transmission to evenly heat the solids, liquids, and gases for use. 2、5 Sets in All: Comes with 5 sets of aluminium heater block, NTC 3950 100K thermistor and 12V 40W 620 ceramic cartridge. 3、Practical Use: Not only designed to 3D printer, but can also be widely applied to automotive industry, food processing, etc. 4、Reliable Work: Having been equipped with these accessories, you will find the printing more efficient with better effect. 5、Easy to Install: Light in weight and compact in size as well, the easy installation can be quickly completed in minutes. Specification： Item Type: 3D Printer Heater Block 3D Printer Heater Block: Set Screw Bore: For M6 and M3 heat pipes and thermocouples. Heater Mounting Hole Diameter: Approx. 6mm / 0.24in Thermocouple Mounting Hole Diameter: Approx. 3mm / 0.12in Application: For Makerbot printers. 12V 40W 620 Ceramic Cartridge Heater: Material: 304 Stainless Steel Lead: 0.3 m㎡ Resistance: 2080 high temperature resistant high quality oxide powder. Application: 1. Semiconductor chamber heating. 2. Semiconductor chip lead connections. 3. Semiconductor leads and chip bonding. 4. Antifreeze and deicing of equipment in cold climates or applications. 5. Humidity control. 6. Heating in treatment devices. 7. Mould and platen heating. 8. Sealing in packaging equipment. 9. Gas chromatography test sample heating. NTC 3950 100K Thermistor: For 3D Printers: For use for TEMP SENSOR 11 in the for Marlin firmware. Small Size: Approx. 1.25 x 2mm / 0.05 x 0.08in glass beads High Accuracy: 1. Resistance value at 25℃ 1% = 100K 2. Wiring Insulation: High Temperature PTFE. Package List： 5 x 3D Printer Heater Block 5 x 12V 40W 620 Ceramic Cartridge Heater 5 x NTC 3950 100K Thermistor