Natural amethyst roller on Empty Roll on Bottles is gentle on the skin, allowing for even, precise application without overusing product. Glass Roller Bottles are suitable for refilling with various skincare liquids, such as essential oils, serums, and custom aromatherapy blends. Empty Rollerball Bottles feature an elegant gradient waist design with a gold metal cap, making them a compact, stylish addition to any skincare routine. Oil Roller Bottles are equipped with a 25mm natural amethyst roller that glides effortlessly without sticking, creating a pleasant physical cooling sensation during use. Amber glass body of Refillable Roller Ball Applicator protects contents from light exposure, slowing oxidation to keep stored liquids stable longer.