Graph Tech ghost Loaded Saddles for ResoMax NV Bridge with Autolock - 4mm Chrome GHOST ResoMax NV Bridge for 4mm Posts Chrome This GHOST ResoMax NV Bridge for 4mm Posts assembly lets you access MIDI and acoustic capability with your favorite electric guitar This bridge is loaded with acoustic pickups that work with the Hexpander, or the Acousti-Phonic Pickup saddles and Bridge Assemblies are different for every type of guitar, so they are always ordered separately from the ghost modules The ResoMax bridge is a Tune-O-Matic style bridge made of super-light weight alloy, to increase harmonic content in every note