1、[Suitable] Suitable for 3D printer extruder, for CR10 CR10S CR10 S5 CR10S Pro V2 Ender3 Ender3 Pro Ender5 Ender5 Pro, etc. 2、[Wear Resistant] Using sophisticated production technology, the printer accessory kit is durable, practical and wear resistant. 3、[Function] With this heat preservation kit, you can safely print more exotic materials, such as PETG, at higher temperatures, and you can also use the cooling fan at full speed. 4、[Thermal Insulation Design] Thermal break, thermal insulation design, reduce the temperature loss of the heating block by reducing heat conduction, and ensure the stability of production. 5、[Good Insulation] Using flame retardant materials, with good insulation, keep the heating block and nozzle clean. Item Type: Silicone Insulation Sleeves Material: Metal, Silicone Aluminum Heater Block Material: Aluminum Function: Heat Preservation and Protection of the Printer Nozzle Scope of Application: Suitable for CR10, for Ender3 Series Size: Approx. 20 x 20 x 10mm / 0.8 x 0.8 x 0.4in Set Screw Inner Hole: M3 M6 Inner Hole of Heating Tube: Approx. 6mm / 0.2in Inner Hole of Thermocouple: Approx. 3mm / 0.1in Application: 3D Printer Extruder, Such As for CR10 CR10S CR10 S5 CR10S Pro V2 Ender3 Ender3 Pro Ender5 Ender5 Pro, etc. 3 x Aluminum Heater Blocks 3 x Silicone Insulation Sleeves 3 x Copper Nozzles 3 x Hoses