A strengthening hair duo for blonde hair.Happy and healthy blonde hair starts with the Olaplex Blonde Perfector Duo. Inside this twopiece set you’ll find a strengthening and smoothing hair treatment that helps to repair hair follicles to permanently rebuild dry; brittle strands and reverse sings of bleach and chemical damage; plus a repairing and toning shampoo for blonde hair; that helps to neutralise unwanted yellow tones for a brighter; softer blonde look.Set Contains: No.3 Hair Perfector No.4P Blonde Enhancer Toning Shampoo