Compatibility：The Heater Block Silicone Sock fit for Creality Ender 3/3 Pro/3 V2, Ender 5/5 Pro/5 Plus, CR-10/CR-10S/CR-10 S4/CR-10 S5/CR-10 mini, Ender-2, Anet A8, etc. MK7, MK8, MK9 hotend.Function:The Silicone Cover will keep your heater block clean and repel plastic of burnt, blackened, and build-up, so that can extend the life of the heater block and extruder; and helps to keep the hotend temperature stable.Upgraded Material:3D Printer Hotend Silicone Sock is made of heat-resistant, non-stick silicone material, high-temperature resistance: 280℃. Good for keeping the hot end clean and temperature stable.Package included:6 Pcs Silicone Cover for MK7, MK8, MK9 hotend heater block，it has good flexibility and can be placed close to the heating block, and easy to install, stable and not easy to fall off, very strong.Customer Protection：Our 3D Printer Accessories use high-quality silicone materials and fine workmanship, If you have any questions about our product, please feel free to contact us, we will do our best for you.