The TonePros AVR2G is the exact replacement for the bridges found on older or vintage instruments originally fitted with ABR-1 style bridges. This bridge is loaded with saddles using a special proprietary formula based on the original vintage Nylon 66 saddle material found in guitars of the late 50's and early 60's. This new material retains the tone of the original Nylon 66 saddles, but adds other hi-tech ingredients that provide a new “slippery” surface. This prevents string breakage and provides superior durability, preventing saddle wear and the breakage problems of earlier Graphite materials. Post to Post Spacing: 2.91 Inches/ 73.75mm