Ifanele isinyithi esinentsimbi, isinyithi esingenawo, i-IC amacandelo amancinci, iingubo, i-ply-metals;iglasi, iiseramics, i-agate, amatye anqabileyo, amacandelo eplastiki amancinci njl.uvavanyo ubulukhuni ezifana ukuba kubunzulu kunye trapezium zomaleko carbonized kwaye ukucima umaleko lukhuni.