Based on anatomical know-how, as I am not a lawyer, I also have 2 -- make that 3 cents to toss in to John's question. Even if told by a metallurgist that they were safe, I wouldn't use them! Most CR members know that their scrotum is just a thin sac of skin and muscle, and made for the limited purpose of temperature control, period. No padding, no armor, no defense (real or implied) from steel bars, zip. I won't say more than to suggest a Google of male anatomy to place the "significance" of "meandering cracks" into proper perspective.
JB (a bit cranky about self-inflicted injury of the least harmonious kind) Froke, Pebble Beach CA