Specification Suitable for 100 ml (3.4 Ounce) Essential Oils Bottle Total Length: 130 mm / 5.12 inch Glass Size: 110 x 7.2 mm / 4.33 x 0.28 inch (L x W) Material: Glass, Rubber Color: Black Package List: 6 Pcs x Glass Dropper Advantage Thick, durable glass construction for long term use Soft rubber bulbs provide strong suction to absorb and retain liquids Screw cap design prevents leaking Dropper and rubber are detachable for easy cleaning and replacement Application Suitable for laboratories or home use for experiments, crafts making, and liquid transferring Compatible with essential oils, acids, oil, watercolor, pigment, and similar liquids Use scenarios: Scientific experiments and liquid transfers in lab or home settings DIY projects and handling of essential oils or pigments Art tasks involving watercolor or pigment application Instruction Insert the dropper into the liquid container Squeeze the rubber bulb to absorb liquid Squeeze the bulb again to dispense the liquid