OLAPLEX Maintenance Duo includes: - OLAPLEX N°5 Bond Maintenance Shampoo 250ml: The fourth step in the Olaplex system. Repairs split ends while gently cleansing your hair. N°4 Bond Maintenance Shampoo is formulated with Olaplex's patented split end reconstruction technology. It repairs di-sulphide bonds while gently cleansing your hair. It restores strength and flexibility with every wash and adds hydration and shine to hair that has been coloured or bleached. - OLAPLEX N°5 Bond Maintenance Conditioner 250ml: The fifth step in the Olaplex system. Repairs split ends without weighing down your hair. N°5 Bond Maintenance Conditioner is formulated with Olaplex's patented split end reconstruction technology. Restores, repairs and hydrates hair without weighing it down. Eliminates frizz and nourishes damaged hair leaving hair strong, healthy and shiny. It restores strength, hydration and shine to hair that has been coloured or bleached.