Features: brand new and high quality Good thermal stability, high temperature and low temperature resistance These also offer a huge boost in temperature stability, particularly if you use high airflow cooling around the nozzle to cool the print. These cases will keep your nozzle clean and free of burnt on blackened- plastic. Toughness and elasticity are very good, and will not be deformed due to external force Used for heating block of 3D printer extruder, high temperature resistance of 280. Specifications: Item Type: Heated Block Silicone cover Model : MK8 heating block Silicone cover Apply:For Ender 3 Heater Block of CR10,10S,S4,S5 Anet A8 MK7 or MK8 or MK9 Hotend Material: Silicone Color: Blue Size: 23 x 23x 12.38mm or 0.91x 0.91x 0.49in (approx.) Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 5 x Silicone Covers for Heater Block