The present invention provides a material having adhesiveness to bone andor fascia, which is composed of a polymeric material comprising carbon as a constituent element, and at least a part of a surface of which is modified by ion bombardment. The task is accomplished, according to the invention, through a method according to claim 1 as well as an electrical apparatus having a corresponding gasket according to claim 6. The shape factors of the track groove of at least one information storage layer of the plurality of information storage layers are different from the shape factors of track grooves of other information storage layers.