The amika Bust Your Brass Bye-Bye Brass 4-Step Kit includes shampoo, conditioner, hair mask, and shine cream, all designed specifically for removing brassiness and enhancing shine in hair. The kit is part of the Bust Your Brass product line and comes in a convenient set that is perfect for at-home use. Each product has a volume of 110mL, providing enough for multiple uses. With a PAO of 12 months, this kit is ideal for those looking to achieve a more vibrant and healthy-looking color in their hair.