Schwarzkopf Professional OSi S+ Rough Rubber is the revolutionary rubber paste for lasting rouged up natural locks. Leaves a rough, mould-able texture with a strong matte effect. With strong style control. To use: Rub a small amount of Schwarzkopf Professional OSi S+ Rough Rubber into the palms of your hands. Apply & work it into the hair, dry or damp. Roughen up your style as you wish.