For best results, paint should always be thoroughly stirred before spraying and the Badger Air Brush Paint Mixer battery-powered tool makes quick work of the job. No messy messy stirring sticks or endless bottle shaking is necessary. Stirring arm fits easily in any small bottle and will fit all Badger 1oz, 3oz and 4oz jars. Requires two AA batteries, sold separately. This paint mixer thoroughly mixes all types of paint and evenly disperses pigment in its base material to assure consistent viscosity of paint from top of the bottle to the bottom.