Xylophones only have wood bars, their metal counterparts are called Glockenspiels, and are usually smaller and have a higher pitch. en.wikipedia.org/wiki/Glo…
There is an unusual instrument called the celeste/celesta which looks like a piano, but has metal plates like a xylophone, instead of strings, inside. This instrument is what gives the Nutcracker's Dance of the Sugar Plum Fairies, and the Harry Potter theme, their distinct sound. youtu.be/Aw7HAyq54rw

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