Leak-Resistant Steel Rollers: Refillable Roller Ball Applicators are equipped with steel rollers that fit snugly to the bottle neck, ensuring mess-free, even distribution of liquids. Versatile Storage Solution: Empty Rollerball Bottles are ideal for storing and applying a variety of liquids, from essential oils and aromatherapy blends to custom fragrances. Thick Shatter-Resistant Glass: Glass Roller Bottles have reinforced bottle openings and bases, paired with PE black caps, making them sturdy enough for repeated refills and use. Portable & Convenient: 10ml Glass Roller Bottles are small enough to carry in your pocket, purse, or travel kit, allowing you to access your favorite liquids wherever you go. Refill Kit: Each pack of Empty Oil Roller Bottles includes a straw, funnel, and bottle opener, streamlining the process of transferring essential oils, perfumes, and other liquids.