The scarcity and high cost of hafnium for use as a reactor control material has lead to the development of a composite control rod of hafnium and B10. The fabrication technique developed involves the use of a wrought hafnium and a 3.5 wt % B10 dispersion in titanium powder. The two components are placed end to end and clad with titanium by a roll bonding technique involving the use of a restraintive stainless steel rolling frame to control the differences in ductility of the two control materials. These composite control rods have been evaluated by bend and tensile testing, thermal cycling, corrosion testing in high-temperature water, control worth, and information gathered on the resistance of the materials to irradiation damage. Favorable results have been obtained from the evaluation study.