Clairol Pure White 40 Volume Developer 16 ozClairol Professional Soy4Plex pure white creme developer contains protective conditioners and emollients and is stabilized for 3 years. It is designed for use with permanent colors, and also perfect for use with all powder and liquid lighteners. Its creamy consistency makes it ideal for bowl-and-brush or bottle application.10-, 20-, 30-, and 40-volume strengths:10 volume for gentle lift20 volume for normal lift30 volume for extra lift40 volume for maximum liftClairol Pure White 40 Volume Developer 16 oz