Skin serum, deodorant, massage oil, essential oil—there are so many uses of a 50 ml roller bottle and tons of bottles out there. But there’s only one bottle that can keep your product fresh for a lot longer: the 50 ml Glass Roller Applicator Bottle. Unlike plastic rollerballs, this bottle’s glass rollerball smoothly glides along your skin and withstands the potency of essential oils or other strong substances. This bottle also comes with an airtight seal, which keeps the fragrance of your product in and harmful air out. And to top it all off, it features lab-designed ultraviolet glass. It not only turns your liquid product into a luxurious-looking one but also effectively filters sunlight. As this bottle lets in beneficial rays, it enhances and preserves the quality, fragrance, and potency of your precious blend. • Airtight, smell-proof, & light-filtering: world's best ultraviolet glass jar with BPA-free plastic lid.