A pack of 3 high temperature non-stick silicone socks. PLEASE NOTE - THESE ARE NOT SUITABLE for the e3dv6 block which uses the cartridge thermistor
They can however be fitted to the various and more common V6/V5 clones which have the screw fitting thermistors
These socks will keep your nozzle clean and free of burnt on blackened plastic. They don't just keep the nozzle clean, but also keep heat inside the hotend, and off the print.
Made of a heat-resistant, non-stick silicone material will repel build-up of molten plastic. This really helps with sticky materials like Co-Polyesters and filled materials that like to build up on nozzles.
These also offer a huge boost in temperature stability, particularly if you use high airflow cooling around the nozzle to cool the print. The additional cooling combined with reduced radiation of heat from the block and nozzle to the print really boost the ability to print great overhangs and bridges, all while keeping the hotend temperature extremely stable.
To fit this style of sock you will need to remove the thermistor and refit once the sock is in place - 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.
These v6 socks come in a pack of 3 because they don't last forever. Depending on what materials you print and how much abuse they get they eventually wear away at the nozzle tip.