Glass Medicine Dropper, Straight-Tip. Our medicine dropper pipettes, also known as eye droppers, are 3-inches in length, and have a capacity of 1ml (approximately 20 drops). We sell both plastic and glass droppers. The glass droppers are sold with either straight or bent tips, and the plastic droppers are available with straight tips. They are available in a variety of quantities. We also sell the 1ml rubber dropper bulbs separately.