Features: 1.Compared to the original thermal cotton, which is easy to wear and tear, the silicone insulation is more durable and works better. 2.The silicone insulation sleeve allows the heating block to be heated to the desired temperature more quickly, and prevents the hot end from overflowing, stabilizing the temperature of the hot end and avoiding environmental influences. 3.With this silicone insulation case, you can enable the cooling fan at full speed and print high temperature materials to increase the success rate of printing. 4.This insulated silicone case is made of high-quality silicone material and is extremely durable. It can be tightly wrapped with a heating block and can be easily removed and installed. 5.Suitable for Creality CR-10/CR10S/Ender 3 MK7 MK8 MK9 3D printer parts heating block. specification:Item Type: 3D Printer Parts Color: Black / Blue (Optional) Name: MK9 Silicone Sleeve Applicable Object: For Creality CR-10/CR10S/Ender 3 MK7 MK8 MK9 3D Printer Parts Heating Block. Product Type: Heater Silicone Case Model: MK9 Heating Block Silicone Sleeve Material: Silicone PackageList:5 x Silicone Case