Eazicolor Developer Volume 60ml work in unison with Eazicolor Professional Hair Color to provide brilliant, multidimensional color. It comes in 3% (10 volume), 6% (20 volume), 9% (30 volume) and 12% (40 volume). When mixed with Eazicolor Professional Hair Color, chroma technology with omega-9 molecules are absorbed deep into the internal cortical hair fibers, ensuring that each hair strand is suffused with vibrant, long-lasting color. Ideal for any coloring and bleaching service.