8 note diatonic step bells for children which are ideal for K-4; the staircase like setup aides students to recognize the relationship between pitch and elevation. Rhythm Band Step Bells This one octave diatonic bell set is ideal for grades K-4. Beginning with C above middle C, this set features bar that are elctronically tuned and properly cut half steps. This instrument is a good piece to teach with and it even comes complete with a pair of mallets.