1 275 inches diameter in the preferred example the sheet stock 11 preferably measures about 0 38 mm thick 15 mils in thick the cap 11 39 s raised center 14 measures about 27 mm diameter 1 075 inch diameter the raised center is deformed away from the plane of annular ring 18 to give about 0 254 mm inset 10 mils in inset internal spacing 17 not to scale in fig4 a or 4 b but more approximately to scale in fig7 9 the embossed cap 11 39 s outer surface is roughened to give a velvet or satin finish eg terms of art the top or outside surface allows printing with reverse image silk screened artwork not shown the opposite surface is also coated with about a 0 05 mm thick 2 mil in thick coating 16 of adhesive the adhesive coating 16 might be for example a 3m u00ae corporation product selling under model no 7959 the flat base 12 may comprise for example 0 13 mm thick 5 mil in thick poly carbonate sheet material cut out into a circle measuring likewise about 33 mm diameter 1 275 inches diameter both opposite surfaces are covered with about a 0 05 mm thick 2 mil in thick coating 16 of adhesive such as and without limitation the above mentioned 3m u00ae model no 7959 the flat base 12 and embossed cap 11 make adhesive adhesive contact with one another along the cap 11 39 s annular ring portion 18 the miniature proximity transponder 13 is pocketed inside the raised.