The K18 Biomimetic Hair Science Sephora Beauty Insider Peptide Prep & Mask is a travel-sized shampoo and mask set designed for all hair types. This unisex product from K18 Hair offers deep cleansing and nourishing effects on the hair. With a sleek design and insider model, this unit includes 0.17 fl oz of shampoo and 1.8 fl oz of mask, making it a convenient and effective choice for achieving beautiful hair.