The Olaplex 'Best of the Bond Builders' Kit is a 4-piece set includes a two-part system of pre-shampoo treatments for weekly use to repair all levels of damage and restore visibly healthier hair. It also includes convenient travel sizes of two OLAPLEX bestsellers–the shampoo and conditioner to hydrate and prevent frizz and split ends. KIT CONTAINS: No.0 Intensive Bond Building Hair Treatment (155ml) No.3 Hair Perfector™ (100ml) No.4 Bond Maintenance® Shampoo (30ml) No.5 Bond Maintenance® Conditioner (30ml)