Olaplex No.4 Bond Maintenance Shampoo 8.5 oz - 6 Pack A highly-nourishing and reparative shampoo.N°4 Shampoo repairs and protects hair from everyday stresses — including damaged hair, split ends, and frizz — by re-linking broken bonds. Leaves hair easier to manage, shinier and healthier with each use. N°4 is color-safe and proven to reduce breakage and strengthen all types of hair.PH Balance: 6-6.5 6 X Olaplex No.4 Bond Maintenance Shampoo 8.5 oz