Made of non-stick silicone, your printhead will stay clean, preventing filament from sticking to the heater block or spout. Can dramatically improve temperature stability, especially if using high cooling airflow around the nozzle to cool the print. In fact, it increases the ability to print large bumps and bridges while maintaining an extremely stable temperature. Very useful silicone socks: will keep your heating block clean and free of plastic blackened and burnt. They will not only keep the beaker clean, but will also keep the heat in and out of your print. Made of heat-resistant, non-stick silicone that will repel plastic buildup molten. It really helps with sticky materials such as copolyesters and filled with materials you want to build into the nozzles. The sock also acts as an insulator for the printhead. This will reduce heat over time and help maintain a consistent temperature while printing. Product Description Specification: Application: Block MK7/8/9 aluminum heater Material: Silicone Net weight: about 3g Usage: Anti-scalding, protect the heater block High Temperature Resistance: 280 degree NOTE: Please allow 1-3mm differs due to manual measurement. If you have any questions, do not hesitate to contact us