Comes with a soft rubber bulb for good suction to get the right amount of fluids into the dropper without dripping or spilling. Pinch the rubber cap to let inside air out, release to fill liquid, and pinch to let the liquid out. Calibration marks are clearly printed for easy reading. Precisely marked measurements help when handling droplets and monitoring accurate blend ratio. Well-packaged to ensure the dropper arrive undamaged. Suitable for blending essential oil, making perfume, adding water conditioner into small aquarium, feeding pets, mixing water color paint, giving liquid fertilizer to plants, measuring food oil, transferring liquid adhesives and embellishments, etc.