Identity Discs (or Light Discs) are the most fundamental piece of equipment to programs in both the Game Grid and in the Tron system. They contain all that a program is, in the form of a detachable glowing disc normally worn on the upper back. Everything seen, heard, or otherwise experienced is recorded on the wearer's disc.
Model consists of parts: bodies, hubs, inner ring, inserts, outer ring, spots. Also use guiding pins with diameter 3mm.
Useful links: http://tron.wikia.com/wiki/Identity_Disc http://herocomplex.latimes.com/movies/tron-legacy-identity-discs-explained-no-theyre-not-just-frisbees/ https://www.youtube.com/watch?v=a2H6TRdHF_s https://www.youtube.com/watch?v=6GCbSd1PXxM