This bottle is a 50mL euro round glass bottle and has an 18-415 neck finish. Miron glass is smell-proof and airtight. The heavy durable ultraviolet glass blocks air exchange and locks in aroma. Premium UltraViolet Glass (UV-A) protects against harmful light and are perfect for storing perfumes, colognes, tinctures, essential oils and any other liquid requiring precise measurement. These premium bottles protect your liquid potency for up to 2 + years. The euro bottle has rounded shoulders and a rounded base, but it is specifically designed to be fitted with tamper-evident, child-resistant, or standard closures with inverted pipettes. Glass has high clarity, can be colored, has high chemical-resistance levels and extremely high resistance to heat and cold. It is great for storing oils. The matching dropper assemblies are available in multiple closure styles and are equipped with the DripTrap patented bulb, which eliminates leaking. There is also an option for graduated pipettes, perfect for accurate dosing. These bottles are sold by the case (160 count).