A mailer, for attachment to an object to be mailed, has an integrally constructed single sheet mailer having a detachable form and a recipient address label. In one arrangement, the devices and methods make use of an expandable body that includes an internal restraint coupled to the body. R1 and R2 represent hydrogen atom, a cycloalkyl group having 5 to 7 carbon atoms, or an alkyl group having 1 to 6 carbon atom optionally substituted with a halogen atom, a lower alkoxy group or phenyl group, with R1 and R2 being same or different with each other. The method further comprises etching away the electrically conductive layer and at least one of the dielectric layers in the second area by means of the first mask and completing an active device in the second area.