Butler- Kevlar Skin Limits

  “Kevlar, you say?” he said, examining the darkened tissue on his chest.

  Artemis nodded. “Apparently some fibers were trapped in the wound. The magic replicated them. According to Foaly, the new tissue will restrict your breathing, but it isn’t dense enough to be bulletproof, except for a small-caliber bullet.”

-The Eternity Code, Chapter 6