Glass Eye Droppers, Black Bulb Glass Droppers compatible with Glass Bottles. Screw Top - 6 Pack (6pc) (15ML) PRlME DAY FLASH SALE -- Want Free Shipping? Easy! Just buy 2 or more! Hurry Limited Stock! Order Your Eye Droppers Today! DESIGNED FOR EFFECTIVENESS AND REUSABILITY - The plastic tubes may get deteriorated by pure essential oils, however, the glass tubes work just perfectly with the essential oils. Moreover, the Glass Eye Droppers are designed for reusability. Just wash the droppers and reuse it again. The glass tube on the dropper is detachable from the rubber top for convenient & better cleaning of the dropper. Wash and reuse over and over again LEAKPROOF - The screw top provides a leak proof seal. This Glass Eye Dropper fits perfectly on bottles with a bottleneck of 18mm/400. CUSTOM FIT Our Oil droppers are custom made to fit 18mm/400 Bottle Necks - Screw Tops