Question

Why are bells made up of metals?

Answer 1

There are other objects meant to vibrate in a bell-like way that are notmade of metal. The most bell-like in sound is an instrument or instruments called Angklung in Thai. Metals used for bells are specially designed alloys that make a nice ringing sound. Smallbells may be made of glass or ceramic
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Answer 2

because metals are sonorous which means they produce shrill sound on striking