Multiple guesses are omitted

Aluminum bat hitting a rock

Ball being hit by a baseball bat

Bell

Door closing (metal latch door)

Elastic band

Guitar string

Hammer hitting an anvil

Hitting a flag pole

Hitting a pole

Hitting a pole on inside

Metal getting hit with a wood spoon

Musical instrument

Pot filled with water being hit - CLOSE GUESS

Rain drop

Someone hitting a baseball

Tapping on a tin can

Tapping the side of a bell while holding the clapper

Wooden spoon hitting aluminum pot