The Hipshot US Contour bridge is unlike any tremolo system out there. Hardened steel pivot pins inserted into a machined brass top plate give the US Contour a bell like tonal quality and silky smooth whammy action! Coupled with a solid machined steel tremolo block, the US Contour can achieve tremendous sustain and volume. And the best part; it is designed to retrofit any guitar using the American Standard tremolo routing convention. No additional routing required.