"3k" numubare wa filaments cyangwa ubunini bwa bundle.Bivuze gusa ko buri "bundle" ya fibre ya karubone ikozwe mu mwenda igizwe na 3000 ya karubone.Umubare munini (6k, 12k, nibindi) bisobanura karuboni-fibre yuzuye "bundles" bityo imyenda ikabyimbye.