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. Best of all, it is designed to retrofit any guitar using the American Standard tremolo routing convention. No additional routing required!