KINDLY TIPS: The silicone socks just fit for 0.78"/20mm x 0.78"/ 20mm x 0.39"/ 10mm heater block, 4 pieces silicone cover for MK7/MK8/MK9 Makerbot heater block.
USAGE: It will keep your heater block clean and free from burnt and blackened plastic. They don't just keep the block clean, but also keep heat inside the hotend and off your print.
Helps to keep the hotend temperature extremely stable, particularly if you use high-airflow cooling around the nozzle to cool the print.
Material: Made of non-stick silicone material, the heater block silicone cover features non-stick.
Heat resistance: high up to 280?.