Redken Acidic Bonding Concentrate Shampoo for Damaged Hair 1.7 fl. oz. Sulfate-free bonding shampoo provides ultimate strength repair, intense conditioning and hair color fade protection to damaged hair. Redken Acidic Bonding Concentrate Conditioner for Damaged Hair 1 fl. oz. Sulfate-free bonding conditioner provides ultimate strength repair, intense conditioning and hair color fade protection to damaged hair. Redken Acidic Perfecting Leave-In Treatment for Damaged Hair 1 fl. oz. This bonding leave-in conditioner for damaged hair helps to strengthen hair, prevent breakage, and reinforce weakened bonds in the hair. Redken Acidic Bonding Concentrate Intensive Treatment for Damaged Hair 1 fl. oz. Redken's most concentrated Bonding Care Complex formula. This pre-shampoo rinse-out treatment provides strength repair in 1 use.