Fishman Matrix Infinity Pickup & Preamp System, Narrow Format Offers clear, transparent tone, dynamic string response, and ease of installation Soundhole-mounted rotary controls for Volume and Tone Features the worlds best-selling undersaddle pickup, the Acoustic Matrix Guitar Pickup: Standard pickup length of 2.65" (67.3 mm) will fit most guitars with 2.5" (63.5 mm) string spacings Ukulele Pickup: Standard pickup length of 2" (50.8 mm) will fit most ukuleles up to 1.85" (47"mm) string spacings