High temperature resistance up to 280 C. Helps to keep the hotend temperature extremely stable, particularly if you use high-airflow cooling around the nozzle to cool the print. Hotend Socks can be used to quickly heat the hotend to a desired temperature as the structure of the silicone inside the sock prevents heat from escaping quickly. With this sock you can safely print more exotic materials such as PETG at higher temperatures while also using the cooling fans at . Actively keeping the hotend very hot and cooling the PETG much quicker before it is laid onto the hotbed can help with success rates on more prints. size: 23 * 23 * 13mm Material:Silica gel colour:black Package Contents: 4 * Silicone Case Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.