Schaller Bass Bridge 3D-4 BC, Bass Bridge, Patented 4-string bass bridge, Analog to 3D-6, The roller bridge saddles reliably minimize string breakage while maintaining intonation and tuning stability, Variable overall height adjustment with included 3mm spacer, Schaller Nr.: 12130400, Dimensions (L x W x H): 80 x 57 x 15(19) mm, Surface: Black chrome