Most of his arm is hidden by three layers of long sleeve, but the hand is clearly visible, and clearly segmented with blunt fingers. The plate joins are what give him traction, not the metal itself.

He lets her grab his arm, since she's not plugging in lights. That's all he'd wanted. "Science. I suppose. It's wired into my spine. Supports on my bones." Giving him some sensation, anyway, though not the same kinds as his flesh arm. "I think for it to move, and it moves, like my other arm."