A gas turbine engine assembly having one or more blade rows with blades extending radially inwardly from a rotatable drum, one or more composite fiber material rings disposed circumferentially around the rotatable drum, and the composite fiber material rings including circumferentially extending high strength fibers or filaments. The rings may be axially aligned with the blade rows. Ring widths of the rings may be less wide than blade widths at blade bases of the blades at a radially inner surface of the drum. The rings may be made of a material including a plurality of circumferentially extending reinforcing structural fibers or filaments disposed in an integral matrix. The rotatable drum, rings, and blades extending radially inwardly from the drum may be incorporated in a gas turbine engine booster having one or more rotatable booster stages or in a counter rotatable low pressure turbine.