1 oz Black Glass Dropper with Tamper Evident Seal (18-400) SKU: GB05D-018 / 77mm Black Our 1 oz Black Glass Dropper with Tamper Evident Seal includes 18-400 Ribbed Skirt Non-Child-Resistant Assembly. In addition, this dropper only fits our 1 oz (30 ml) Euro Dropper Bottles. This dropper assembly features a Black monprene bulb. However, it does have a non-child resistant polypropylene cap. Therefore, opening this dropper is fairly easy, you twist counterclockwise to open. In addition, the GBO5D features a Tamper-Evident dropper cap assembly that has a disconnecting ring when opened for the first time. Above all, a 77 mm straight tip glass pipette with dropper dispensing between 0.5 mL – 1.0 mL of liquid per stroke. This item 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, polypropylene dropper caps make precise dispensing easy. For instance, it 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, you can pair this 1 oz Black Glass Dropper with Tamper Evident Seal with various bottles that match an 18-400 neck finish, and a 77 mm black tamper-evident bottle height. Therefore, To help you in your product search. Pair this dropper with one of our great “Matching Items” below.