- These Hot Red glass Serum bottles with glass dropper makes dispensing liquids easy and mess- free. The top is fitted with a rubber bulb that enables to distribute the liquid as needed Refillable: The neck of the bottle has enough diameter to fill and clean the bottles with ease. Clear glass dropper: These clear glass dropper allows controlled product dispensing Travel Friendly: Suitable for travel, and conveniently fits in your purse/bag Usage: Ideal for essential oils, serums, tinctures skin care oils, massage and beard oil. Safe for storing liquid medications as it does not allow chemicals to be transmitted into the contents of the bottle. Can also be used for feeding pets