Johan's Blade R4-MB has an offset double cutaway light ash body, black pickguard, bolt-on maple neck, 22-fret maple fingerboard with black dot inlay, Falcon tremolo system, graphite nut, 6-per-side Sperzel Trimlock tuners, black hardware, 3 SS-1 single coil pickups, volume/tone control, 5-position pickup selector switch, VSC switch, Variable Spectrum Control active electronics. Finish is Ocean Blue, it was made in early 1989.

The MB probably stands for "black hardware" since the R4-MG had gold hardware.