A composition for use in bleaching hair in combination with a liquid peroxide based oxidizing agent, said composition comprising an effective amount of at least one persulfate salt dispersed in a silicone oil base and a method for bleaching hair with said composition. The grooving can be a continuous spiral groove formed in the outside surface of the drum shell. A coupling mechanism is provided between the coupling members provides for transmitting a force between the coupling members over a range of deflection of the first coupling member, permitting large relative movement between the panels. The message and the user identifier are provided from the application to a private network.