Nioxin SYS4 Care System Trial Kit for Colored Hair with Progressed Thinning delivers denser-looking hair and restores moisture balance. System 4 is specially designed for noticeably thinning, fine, chemically-treated hair. It delivers denser-looking hair while protecting the scalp and providing moisture balance to coloured hair.- Nioxin Cleanser 4, 150ml/300ml - nourishing shampoo designed to cleanse both hair and scalp of dirt, excess sebum and impurities for a refreshed surface.- Nioxin Revitalising Conditioner 4, 150ml/300ml - fortifying conditioner designed to envelop tresses in a strengthening treatment while helping to replenish both hair and scalp with hydration.- Nioxin Scalp Treatment 4, 40ml/100ml - innovative treatment formulated to soothe damaged strands, helping to protect the locks from further breakage while revitalising the scalp.! Small set is enough for one month, Medium - for two months. For best results, it is recommended to use it for at least a few months!