Made of heat-resistant, non-stick silicone material, will repel build-up of molten plastic, high temperature resistance: 280?.
Helps to keep the hotend temperature extremely stable ,particularly if you use high-airflow cooling around the nozzle to cool the print.
Can extend the life of the heater block and extruder by keeping it cleaner,also keep heat inside the hotend and off your print.
Professional for 3D printer extruder, heated aluminum block silicone protective sleeve for MK7 MK8 MK9.
How to use it : Push the covers onto the front of the Hot End with no disassembly - they will be a tight fit when first pushed on cold, when hot the silicone will expand to the correct size to fit the hotend snugly.