Matrix Socolor Beauty Oil Cream Developer 9% 30 Volume COLOR INSIDER OXYDANT 9%/30 VOL 1L 33.8 Ounce 1000 Milliliters This color activator is used with a matching color line of hair dye and is simple to use. *This is a professional product and should be used only by a trained individual. Seller is not liable for any adverse outcome resulting from the use of this product.