Kawasaki built motorcycle, available in various guises since the year "dot",and in 305, 500, 550, 600, 750 (inc 750Turbo) 900 and 1100 CC engine sizes.
a Capable all rounder, with a half fairing (and belly-pan on some models) but not going to keep up with modern sports bikes.
The GPZ500 is still on sale in the UK today, as a 500cc vertical twin engine, than it identical to the first GPZ500, except for the alternator housing being a difference shape.
Called the EX500 in the US.