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 Specifications: Model : for V5 Silicone Sock Material: Silicone Color: Black / Yellow Size: Mixed pls see the pictures Optional Quantity: 5 PCS/Set Package Includes: 5 PCS x Silicone Cover 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.