The E503 is a 5ml Cobalt Blue Euro bottle with a 18-415 neck. The characteristics of the Euro bottle is similar to the Boston round with a wide base. This product is perfect for essential oils, e-liquids, pharmaceuticals, fragrances, and other liquids. The cobalt blue color of the bottle provides some UV protection which makes it perfect for light-sensitive products. This bottles neck is designed for a tamper evident ring and can be paired with closures that have a pipettes length of 48mm and a neck size of 18-415. Shop the matching closures below.