16 Ounces. Professional Formula with Equalizer 3. Rich, high lathering Quantum leaves all hair types clean, shiny and manageable. This special pH-balanced formula rinses away dirt and excess oils without stripping the natural moisture essential to healthy-looking hair. Oil free and mild on both hair and hands. Quantum Shampoo is ideal for daily use. Only Quantum has Equalizer 3 to condition hair in three ways; Smoothes the cuticle to enhance shine and manageability. Helps prevent damage and eliminate static flyaway. Improves body and texture.