The black bulb polypropylene caps with straight glass droppers fit our 1 oz. serum bottles, including our Time Warp, Rejuvenate, Clear Serums, and more. The easy to use glass droppers are perfect for when you want better control of the quantity you are dispensing and also make an excellent choice for dispensing essential oils or other liquid products.

Neck Size: 20/400  (7mm/75mm)