Dropper assemblies are an important part of your package. Your customer wants to make sure that your product doesn’t leak or isn’t affected by the dropper. NNBC’s dropper bulbs are made from Thermoset plastics , which don’t interact with the customer product, and which provide a positive thread engagement that never “jumps” over the bottle thread, like some PP plastic caps can. Also, because our plastic is stiffer, we can place more even pressure on our silicone rubber seal, insuring that your customer has a leak free product. See the performance difference that thermoset plastic dropper assemblies and caps can make in your product today.