This printer hotend silicone sleeve is easy to install and not easy to fall off. It can keep the heater block clean and effectively prevent plastic from burning, blackening and accumulation. It also helps to keep the hot-end temperature stable and extend the service life of the heater block.Specifications:Material: SiliconeSize:(L * W * H) 23 * 23 * 13mm/0.9 * 0.9 * 0.5inchColor: BlackPackaging List:5 X Printer Heater Block Silicone CoverNotes:1. Small items may include, please keep them away from little children.2. Manual measurement, please allow slight errors on size.3. The color may exist slight difference due to different screen displays.