3K has 3,000 fibers in each bundle 6K has 6,000 fibers in each bundle There are 12,000 fibers in each bundle There are 24,000 fibers in each bundle High strength, suitable for modeling, repairing, racing parts, etc Carbon fiber is mainly composed of carbon element, with high temperature resistance, friction resistance, electrical and thermal conductivity, corrosion resistance and other characteristics of the shape is fibrous, soft, can be processed into a variety of fabrics, because its graphite microcrystalline structure along the fiber axis preferred orientation, so along the fiber axis direction has high strength and modulus. Carbon fiber has low density and therefore high specific strength and modulus. Carbon fiber is mainly used as reinforcement material and resin, metal, ceramic and carbon composite, manufacturing advanced composite materials. Carbon fiber reinforced epoxy resin composite has the highest specific strength and modulus in the existing engineering materials.