Abstract: A hair roller which can be heated by induction has a cylindrical core (1) formed of ferromagnetic material enclosed within a heat storage layer (2) which is heated by conduction from the core. The layer (2) is formed of cellular silicone rubber which modifies the rate of heat transfer to an outer gripping layer (4). An end cap (5) incorporates a thermo-sensitive substance (10) which changes colour when the roller is heated to its working temperature. The roller can be handled immediately after heating and provides a sustained level of heat output.