The OLAPLEX set includes:1 x OLAPLEX No. 3 Hair Perfector, 100 ml1 x OLAPLEX No. 4 Bond Maintenance Shampoo, 250 ml1 x OLAPLEX No. 5 Bond Maintenance Conditioner, 250 ml1 x OLAPLEX No. 9 Bond Protector Nourishing Hair Serum, 90 mlOLAPLEX No. 3 Hair Perfector: Used weekly between chemical applications to strengthen the hair. Sufficient for at least 15 applications.OLAPLEX No. 4 Bond Maintenance Shampoo: Visibly improves hair structure and gives hair incredible shine.OLAPLEX No. 5 Bond Maintenance Conditioner: Repairs and hydrates hair without weighing it down, improving structural damage and reducing split ends. For strong, healthy and shiny hair.OLAPLEX No. 9 Bond Protector Nourishing Hair Serum: Dull hair, tangles or ill-fitting hairstyles? These could be signs of environmental pollution or heat damage. Protect your hair from daily damage with this new weightless, silicone-free leave-in hair serum that protects your hair from pollution for 48 hours and provides heat protection up to 2