Bonaldo Hoppy Modern Bar Stool by Giorgio Manzali. The modern Hoppy bar stool was designed by Giorgio Manzali. This beautiful and functional bar stool is made by Bonaldo in Italy. The sleek and stylish bar stool can swivel and features a height adjustable gas piston. This bar stool has an adjustable seat height between 20" and 30". This adjustable seat height allows this stool to to from counter stool to bar stool with an easy touch. This would be a great stool for the kitchen area or for a restaurant or bar. The seat of this bar stool is leather which features black stitching along the edges. The frame of the stool is chromed steel.