4-PACK (30ml each): Sterile solution sealed with care. Ingredients are 99.1% deionized water and 0.9% benzyl alcohol. TRANSPARENT GLASS: We use clear, premium glass bottles instead of cheap plastic, or amber-colored glass where you're unable to see the contents inside. QUALITY START TO FINISH: Harmonify utilizes a deionized water system with a UV light ultimately providing purified water for use in this formulation. MANUFACTURED IN-HOUSE: All bottles and rubber injection ports are sterilized with an autoclave before the filling process takes place in the lab.  MADE IN USA: Proudly made in Columbus, Ohio by HARMONIFY, since 1983.