Step 1 base of a two step process of bosley pro bos renew scalp micro dermabrasion works with professional strength bos renew scalp micro dermabrasion booster treats hair scalp at a cellular level improves the health of follicles reduces hair loss provides a healthier environment for new hair growth perfect for all hair types for professional salon use only to use mix 16 base with suggested ration in bowl apply with color brush to dry hair leave on for 5 15 minutes shampoo