This instant heat source is designed to work on all clarinets, piccolos, oboes, flute trill and C keys, and the upper stack keys (nickel or silver plated) on saxophones where using a torch around pearls and felts can be difficult. No more having to bring a flame within close contact of the instrument. This means no scorching of pads, corks, or instrument bodies. And the graphite electrodes won’t scratch the key finish. Since this tool uses the metal of the key cup itself to conduct heat, it will not work on keys that have a lacquered finish.