mcrdt s txt r n mg sbstntlly rdcd n sz t prvnt dtctn by nntndd rcpnts. Mcrdts r nrmlly crclr nd rnd 1 mllmtr (0.039 n) n dmtr bt cn b md nt dffrnt shps nd szs nd md frm vrs mtrls sch s plystr r mtl. Th nm cms frm mcrdts ftn hvng bn bt th sz nd shp f typgrphcl dt, sch s prd r th tttl f lwrcs r j. Mcrdts r, fndmntlly, stgngrphc pprch t mssg prtctn.