The ResoMax NVS 4mm bridges will fit all Gibson USA guitars. ResoMax alloy bridges are triple plated for durability and good looks--and the AutoLock that magnetically secures your bridge to the guitar at all times without a tool to use or lose! The ResoMax NVS comes equipped with U.L.F. (ultra low friction) saddles. U.L.F. saddles are made from the same harmonically rich alloy as our bridges but are bonded with an ultra hard low friction formula designed to drastically reduce string breakage, improve tuning and retain the 2KHz bite of metal saddles.