"3k" shine adadin filaments ko girman daure.Yana nufin kawai kowane “daure” na zaren carbon da aka saka a cikin zane ya ƙunshi filament carbon guda 3,000.Mafi girma yawa (6k, 12k, da dai sauransu) yana nufin kauri carbon-fiber "daure" kuma saboda haka kauri yadudduka.