Olaplex No. 4 Bond Maintenance Shampoo - a highly nourishing and reparative shampoo - it 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. No. 4 is color-safe and proven to reduce breakage and strengthen all types of hair. Olaplex No. 5 Bond Maintenance Conditioner - a highly moisturizing, reparative conditioner for all hair types - leaves hair easier to manage, shinier and healthier with each use. Protects and repairs damaged hair, split ends, and frizz by re-linking broken bonds. It is color-safe and will strengthen and leave your hair stronger than ever. This is a set of the shampoo and conditioner - originally 100 ml / 3.3 fl oz each - each used one time and about 75% of contents remains.