UV Resistant: The classic Amber Glass Dropper Bottles with UV resistant maintains liquids sensitive to degradation from light Refillable : The refillable sample glass bottle, made of glass without bisphenol A, can easily wash and dry to be reused again and again Good Sealing: Good sealing of Amber Dropper Bottles apply to storing materials which are sensitive to degradation from light Accurate Application: The glass straw equipped in the refillable sample glass bottle can be used comfortably and accurately Durable : The Amber Glass Dropper Bottles are made of durable glass, ensuring long-lasting use