This is a DEVGFC-502 1 Liter Gravity Gun Cup. Devilbiss gravity cups are made of strong lightweight acetal, or aluminum for durability. In addition, an integral drip check in the cup lid virtually eliminates leaks from the vent hole. These cups can be used with E-Z Liner disposable cup liners which reduce clean-up time, solvent use & allow upside-down spraying.