DT120B is a black Child Resistant Certified and tamper evident dropper with a ribbed skirt, rubber bulb, and glass pipette with graduated markings. This dropper has a 110mm dropper and has a neck size of 20-415. This dropper fits on 4oz (120ml) Boston round bottles. This dropper is perfect for essential oils, e-liquids, pharmaceuticals, fragrances, and other liquids.