5 ml Black Child Resistant Glass Dropper (18-400) SKU: GB18-018 / 48mm Black Our 5 ml Black Child Resistant Glass Dropper includes an 18-400 Ribbed Skirt Dropper Assembly. In addition, this dropper fits our 0.16 oz (5 ml) Boston and Euro Glass bottles. This dropper assembly features a black monprene bulb. A child-resistant polypropylene cap and a 48 mm glass pipette. Therefore, polypropylene dropper caps make precise dispensing easy. In addition, these Child Resistant Droppers require two separate motions to open, making it challenging for children to open while remaining senior-friendly. Therefore, in order to open, you will need to push down and twist counterclockwise to open. Above all, this dropper is great for a variety of uses from aromatherapy and essential oils. Polypropylene marked (PP) has very good resistance to fatigue and has an extremely high melting point. (320 degrees Fahrenheit or 160 degrees Celsius) In conclusion, This 5 ml Black Child Resistant Glass Dropper has an 18-400 neck finish. For instance, the first number refers to the diameter (in mm), and the second refers to the closure depth, style, and thread. Therefore you can pair this dropper assembly with various bottles that match an 18-400 neck finish, and a 48 mm glass pipette bottle height. To help you in your product search, pair this dropper with one of our great “Matching Items” below.