Abstract: The present disclosure provides a frame component for a window or door that employs composite materials in a manner that is sufficiently structurally strong yet resists degradation due to unfavorable environmental conditions. In at least one embodiment the present disclosure provides a mullion for a frame for an opening having a core assembly having a longitudinally extending core and at least one end block, a first surface of the end block abutting a first end of the longitudinally extending core to result in the core assembly having a radial surface extending radially about the core assembly; and a longitudinally extending outer sheath, the longitudinally extending outer sheath enveloping the radial surface of the core assembly, an inner surface of the longitudinally extending outer sheath bonded to the radial surface of the core assembly in a continuous manner.