Vintage 1954 Knickerbocker Melody bell set, this was a musical toy where you learned simple songs.  Each bell has a metal clapper, all sound a bit different according to the note. The colorful bells are hard plastic, and are in very good shape.  Each bell is marked, Knickerbocker No. Hollywood, Calif. They are 3 3/4" tall with a diameter of 2 3/4".