The ColorpHlex Professional Kit Contains: Step 1: Color Strengthening Additive 2 oz - 2 bottles Step 2: After Color Strengthening Finish 4 oz - 2 bottles colorpHlex? protects and strengthens hair during the color and bleach process, reducing damage and breakage. THE COLORPHLEX? DIFFERENCE colorpHlex? improves the strength and quality of the hair from the inside out. Scientifically formulated, colorpHlex? uses a naturally derived vegetable protein molecule that penetrates the hair, reinforcing bonds during the color and bleach process. Clinical trials show that a small amount of colorpHlex? added to hair color or bleach makes hair up to 4X stronger, significantly reducing breakage, retuning hair to its natural healthy state. We recommend colorpHlex? home care products for home use to extend salon results.