5x Official Creality 3D Printer Hotend Silicone Sock Heater Block Silicone Cover 

Parameters

Color: Black

Material: Silicone

Item Weight: 2g

Size: 23*23*13 mm/0.9 x 0.9 x 0.5 inch

Packing List: 5 x Silicone Cover

Features

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.