Essential Oils Glass Roller Bottles, Refillable Roll-on Bottles with Stainless Steel Roller Balls, Foundation Set 6 Pack for Aromatherapy(0.5ml Dropper included) Effektiv Oil Protect: The glass is classically tinted to filter out harmful UV Rays to protect the essential oils. Mix Your Own Recipes - easy mix of essential oils, perfume oils and other liquids. 6 Roller Bottles - With smooth Stainless Steel rollers & black caps & dropper. Perfect for Travel - with a travel size (10ml, 0.33 fl oz), suitable for your purse. Roll-On Bottles the most convenient and economical way to dispense essential oil blends. A refillable roll on bottle will allow you to pre-dilute your oil blends so that they can be applied directly to the skin without messy drips or spills.