Features: Made of crack and flame resistant rubber foam. Stay on the filament tip during storage to prevent it from self unwinding. Used for cleaning dust of filament, prevent your nozzle from being blocked by a buildup of debris and extend nozzle\'s and hot-end\'s using life. 3D print filament dust removal foam block can easily slide kover standard 1.75mm or 3.0mm (optional) diameter ABS,PLA or other filament. 100% brand new and high quality; useful filament cleaner for 3D printing.