Smooth rolling ball for easy even oil application、 no more rollers getting stuck or falling out.<br />    Aromatherapy Cobalt Blue Glass Roll On Bottles 10 ml、 6 Units<br />    Cobalt Frosted blue glass to protect your expensive oils and perfumes from light and UV damage.<br />    Use Rollon Bottle with Essential Oils、 Perfumes、 Lip Gloss and More<br />    Great Size For Travel