Chose the Bergerault MAD alto metalophone and the Bergerault XAD alto xylophone, as a pair, for enjoyment and discovery of music with the grandchildren. Very pleased with the tuning and sound of the bars and boxes, and with the comfortable 40mm-wide bars. The damper feature on this metalophone makes it more versatile by allowing it to play shorter notes like the xylophone, as well as the more usual use as the harmony instrument in the pair.