Feature: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.How to Use:Install and UseSpecification:Item Type: Silicone Insulation SleevesMaterial: Metal, SiliconeAluminum Heater Block Material: AluminumFunction: Heat Preservation and Protection of the Printer NozzleScope of Application: Suitable for CR10, for Ender3 SeriesSize: Approx. 20 x 20 x 10mm / 0.8 x 0.8 x 0.4inSet Screw Inner Hole: M3 M6Inner Hole of Heating Tube: Approx. 6mm / 0.2inInner Hole of Thermocouple: Approx. 3mm / 0.1inApplication: 3D Printer Extruder, Such As for CR10 CR10S CR10 S5 CR10S Pro V2 Ender3 Ender3 Pro Ender5 Ender5 Pro, etc. Package List:3 xAluminum Heater Blocks3 x Silicone Insulation Sleeves3 x Copper Nozzles3 x Hoses