Fibre fibre ni fibre idasanzwe ikozwe muri karubone, mubisanzwe ifite karubone irenga 90%. Ni fibrous, yoroshye kandi irashobora gutunganyirizwa mumyenda itandukanye. Ibiranga fibre ya karubone harimo uburemere bworoshye, imbaraga nyinshi mugihe ukomeza modulus nyinshi, hamwe no kurwanya ubushyuhe, ruswa, gukubita no gusohora. Mubyongeyeho, irashushanya cyane kandi iroroshye. Ikoreshwa cyane mubice byinshi nko mu kirere, ibicuruzwa bya siporo, kubyara ingufu z'umuyaga hamwe nubwato bwumuvuduko nibindi.