Perfume Studio® Set of Premium Grade Smalt Blue Cobalt Glass Bottles with Removable Fine Spray Tops. The Boston round glass bottles come securely packaged in a box of 4 units. Each blue glass bottle holds 2 fluid ounces and has a screw in fine mist sprayer. Multiple Applications: They are ideal for essential oil formulas, fragrances, cooking oils, hair solutions, beauty products, natural bug sprays, home made tanning oil, cleaning solutions, plant sprays, bathroom fresheners, DIY hand sanitizer, and many other soluble thin liquids. These cobalt blue glass bottles are durable, easy to wash and reusable; the preferred quality spray bottles by professionals. SHIPS NATIONWIDE DIRECTLY FROM OUR PERFUME STUDIO WAREHOUSE.