Super handy to carry around with you for essential oil blends or fragrances.refillable so you can use it over and over again! amber and clear glass roller vials: 0.338 oz. (10 ml) glass roll on bottles with capsthese come with the clear glass or amber bottle, metal roller ball, and black cap. large clear roller vial:8.1 dram (30 ml) clear glass vials include roller ball with housing and black pp cap bpa free, fda approved. choose your favorite!