Expertly formulated for finer hair types, the Olaplex No.4 and No.5 Fine Shampoo and Conditioner duo delivers lightweight hydration to leave weakened strands feeling stronger and visibly fuller-looking thanks to patented Bond Building Technology™. Set Contents: No.4 Fine Bond Maintenance Shampoo 250ml The high-performance cleanser builds a rich lather to lift away impurities and excess oil, while helping hair appear fuller, stronger and more voluminous. The shampoo delivers weightless hydration and a silky-soft finish, ideal for delicate textures in need of visible strength and shine. No.5 Fine Bond Maintenance Conditioner 250ml The silky formula helps to smooth and soften without weighing strands down, leaving hair feeling fresh and fuller-looking. The conditioner supports stronger, more resilient-looking lengths while maintaining a light, glossy feel.