DN1866W is a white Non-Child Resistant Certified dropper with a ribbed skirt, rubber bulb, and glass pipette. This dropper has a 66mm dropper and has a neck size of 18-400. This dropper fits on 0.5 (15ml) Boston and Euro round bottles. This dropper is perfect for essential oils, e-liquids, pharmaceuticals, fragrances, and other liquids.