Anatomy of Metal

Terms to describe body parts, literally or metaphorically. Has nothing to do with the Metal genre of music. Also has nothing to do with Bladder of Steel, which is about video games that don't let you pause.

Tropes

 * Balls of Steel
 * Boobs of Steel
 * Brass Balls
 * Feet of Clay
 * Hidden Heart of Gold
 * Jerk with a Heart of Gold
 * Nerves of Steel