Abstract: Composite tube, which is a sandwich structure, comprising a plurality of fiber strata, each made of epoxy-saturated fibers, and at least one layer of a honeycomb material sandwiched between. The fiber strata and the honeycomb layers are in alternating sequence. Each fiber stratum may include a fiber web surrounded by a fiber cable, which consists essentially of a large number of twisted fibers arranged in the axial direction and parallel to each other. The composite tube of this invention is very light in weight, yet has tensile strength and other mechanical properties corresponding to those of conventional tubes made of steel. The tube of this invention is especially useful as a guide roller or an expansion shaft.