"3k" bụ ọnụọgụ filament ma ọ bụ nha ngwugwu.Ọ pụtara na “nchịkọta” nke ọ bụla nke eriri carbon a kpara n'ime akwa ahụ nwere filament carbon 3,000 n'otu n'otu.Ọnụ ọgụgụ buru ibu (6k, 12k, wdg) pụtara "nchịkọta" carbon-fiber toro ogologo na ya mere akwa akwa.