The K612 is a 2oz Matte Black Boston Round bottle with a 20-400 neck. The characteristics of the Boston round bottle are its unique shape and wide base. This product is perfect for essential oils, e-liquids, pharmaceuticals, fragrances, and other liquids. This bottle can be paired with closures that have a pipettes length between 89mm-91mm and a neck size of 20-400. Shop the matching closures below.