The OLAPLEX set includes:1 x OLAPLEX No. 0 Intensive Bond Building Hair Treatment, 155 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. 0 Intensive Bond Builiding Hair Treatment: The intensive repair booster prepares the hair for treatment with OLAPLEX Hair Perfector No. 3. As a 2-step home treatment, No. 0 and No. 3 repair broken disulfide bridges in the hair and sustainably strengthen the hair structure.OLAPLEX No. 4 Bond Maintenance Shampoo: Visibly improves hair structure and gives hair incredible shine.OLAPLEX No. 5 Bond Maintenance Conditioner: Repairs and hydrates the hair without weighing it down and improves structural damage and reduces 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. Protec