All dropper bottles feature an 18-DIN neck designed to accommodate our EuroDrop caps. Pair with a dropper insert and one of several cap styles and your all-in-one dispensing system is complete. Available in amber, flint, cobalt and green glass. Capacities ranging from 2.5ml to 200ml are sourced from Carow selected European and Asian suppliers. Many styles are in stock and ready to ship.rom 5 ml to 100 ml. Many sizes in stock and in low minimums for immediate delivery.