These are the Upscale, Elegant MATTE Aluminum Caps. They fit all our Clear, Amber and Colored (5ml, 4ml), Dram and 1/3 oz glass Roll on Bottles! Cap your bottles beautifully, make a great presentation, and have A bottle that will preserve your perfumes, serums, perfumes, and EO/Essential Oils, and act as an applicator too! Perfect for all essential oils and aromatherapy products. If you've been searching for a new cap for your bottles in which to store Cologne, Perfume, Perfume oils, Rose Hip Oil, Argan Oil, Essential Oils, Jojoba and other Carrier Oils, facial serums, and your tonics, this is perfect. Also used for your Bath Oils, Perfume Oils, Bath and Body products, and many other natural or organic products.