Security packages are disclosed having features that give increased resistance against theft by preventing or slowing opening of the package. The mold has a plurality of radially movable and outwardly expandable inner segments for forming the inner surface of the tread belt and a plurality of radially movable and contracting outer segments for forming the outer tread belt surface. Substrates formed from this method can have a carrier lifetime between about 0. At least two slave sample and hold circuits connect to the master output.