Grey Wing Bridge is a mechanical oscillator driven by the Actuator that vibrates on the Soundboard. At the tip, where it rests on the Soundboard, different materials have been curated for their unique sonic qualities, and to match the kinetic behaviours of each bridge shape. This spring-steel rectangular Bridge is our standard dimension bridge optimized for the Actuator. The tip is made of soft neoprene foam, which results in a mellow, balanced acoustic effect on the soundboards.