New in bottle. Foil seal is still under lid and unopened. 8.5fl oz/250mL From Olaplex website: A deeply cleansing yet gentle and color-safe clarifying shampoo that removes heavy metals, hard water minerals, chlorine, pollutants, product buildup, and excess oil that can cause dull, discolored hair. N°.4C helps revive soft, vibrant hair without leaving it dry. Use it weekly or as needed to hit the reset button on healthy-looking hair.