Amorphous Fe-Si-B glass-covered and glass-removed wires have been studied in the as-received state and after furnace annealing at 480/spl deg/C for various times. The M-H loops and magnetic field dependence of Young's modulus measurements have shown that the as-received, glass-covered wire has a single domain configuration with the easy axis parallel to the wire axis. It is suggested that the core-shell domain model applies in annealed, glass-covered and as-received wires after removal of the glass.