The Olaplex No 4 Bond Maintenance Shampoo and No 5 Conditioner Set includes two standard-sized bottles of 250ml each, perfect for all hair types. These products, formulated with biotin and sodium lauryl sulfate, offer nourishing effects and repair damage to the hair. The unscented shampoo and conditioner are part of the Olaplex Professional product line, designed to restore and improve the health of your locks. Made in the United Kingdom, this set is ideal for women and unisex individuals looking to maintain and strengthen their hair.