These beautiful cobalt blue glass bottles hold 30ml, or 1 Oz. They are dark glass bottles, perfect for protecting your valuable essential oils from UV Damage, or any sunlight damage. Use them for vitamins, floral waters, oil blends, facial serums, oil blends, liqueurs, and are perfect for holding almost any liquid. Each Comes with a black phenolic lined plastic cap. perfect for essential oil storage and drops. The quality is perfect. high quality, beautiful bottles!