: An optical fiber cable includes a fluted strength member core which comprises a plurality of ribs extending radially from a center portion and a plurality of grooves, each groove being disposed between two adjacent ribs. The fluted core is such that the ratio of the diameter of a circle which passes through an outermost surface of each rib to the diameter of a circle through the inverts of the grooves is at least a predetermined value and cooperates with a reference width of each rib to allow a plurality of optical fibers to be disposed in each groove. Further, the geometry of the fluted core is such that the optical fibers are capable of longitudinal and lateral movement in the grooves. A core wrap which may be made of a flame retardant material encloses the fluted core and a jacket which is made of a plastic material encloses the core wrap.
