It looked like a cat had walked across a keyboard. That was the first thought of Dr. Elara Vance when she saw the transmission:

She typed the letters slowly, not as a word, but as a path . She placed her finger on S, then moved to R (up and right), then to T (up and left), then to Y (up and right), then to M (down and left). She traced the motion.

Primarily plastic, which contributes to their light weight but may feel less "premium" than metal-framed headphones.