The Olaplex Hair Spa Kit consists of Olaplex No.4 Bond Maintenance Shampoo to wash away any impurities of the hair while rebuilding the bonds. Condition with Olaplex No.5 Bond Maintenance conditioner. The perk of using No.5 is that while it’s hydrating the hair, it’s using Olaplex’s patented technology to rebuild the hair simultaneously, leaving it shiny, smooth, and resilient. After rinsing the No.5 out of the hair, on damped hair use Olaplex No.6 Bond Smoother to prep the hair for a fantastic blowout! The Nº.6 and Nº.7, can be applied together as a cocktail for a streamlined routine.Nº.6 leaves the hair feeling soft, smooth, and manageable.