Neewer&reg; SH-85 Black 6 Hole Soundhole Pickup with Active Power Strap End-Pin Jack for Acoustic Guitar SH-85 Black 6-Hole Soundhole Pickup for Acoustic Guitar Excellent bass and mid-range response and soft acoustic tone Available 3 11/16"and 4 1/8(94-105mm)diameter sound hole Shock-absorbing foam lines the inside edges of both mounting brackets With strap end-pin jack