The Pure Resonator BB is designed especially for biscuit bridge resonator guitars. It features a screw-mounted pickup for best possible sound transmission with maximum feedback resistance. The pickup is pre-wired for external jack mount with a Dual-Lock (by 3M) fastening system. The jack can also be installed internally if the Dual-Lock is removed (approved professional installation required). The Pure Resonator BB was updated in December 2017 to further optimize string-to-string balance.