Hollow chrome to your collarbone
Ping against your dome piece and sound like the first key on a xylophone
The hollow chrome refers to a bullet with a hollow tip. As does the second line: The skull is known to be very hard and when you hit it with a bullet it may make a hollow sound from the bullet bouncing off.
The first few keys on a xylophone are also known to sound quite deep and hollow.. The hollow sound may also be a pun playing on the hollow tip.
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