These chime bars are a little like the glockenspiel in that they are metal and produce a bell-like sound when beaten. The benefits of having separate bars is that bars can be played by different children at the same time, producing sounds like a chord drone (3 notes playing on the beat altogether), or for effect (low and high, fast and slow). In addition, these bars can be easily used by the teacher to encourage children to walk slowly or quickly, because they are so easy to hold and move around. Very versatile! These full set of chime bars come with 2 beaters.