This NEKPro Hydrogen Peroxide is made with more natural ingredients which does not irritate scalp, cause burnt scalp feelings. It does not have strong smell, and is good for even sensitive scalp. Product Description It comes in 3 strengths: 6% (20 vol), 9% (30 vol) and 12% (40 vol). Use them as follows: 6% for tone-on-tone colouring, white hair coverage and lightening 1–2 levels; 9% for lifting 2–3 levels (3–4 levels with the Special Blondes), colouring with -00 shades and white hair coverage with the Absolutes; 12% for lifting up to 5 levels and for colouring with the Fashion Lights. Benefits Developed high performing peroxide and developed by colorists. Enables color pigments to penetrate faster into the hair, giving more intense and longer lasting color results. Gives more shine and perfect equalization of color from the roots to the tips. Recommended products It mix with any colour well and blend into your hair easily which will make the colour appear on your hair smooth and shine. There are 3 types : 6% 9% 12% All have 2 sizes: 1000ML & 100ML ** Recommended to wash your hair using NE Chemical Enhance Treatment after doing any chemical process as it will wash off all chemicals residue in your hair. ** NE treatment is not included in this package, it’s sell individually.