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 jack can be installed externally or internally. The pickup is pre-wired to an endpin jack, including an external Dual-Lock Velcro fastening system. The jack can also be installed internally if the Dual-Lock Velcro is removed. A flush mount nylon jack is supplied as well for optional internal installation