B-Band 22R UST Transducer - under-saddle condenser transducer, operation based on a worldwide-patented elastic electret film, sizes to fit a wide range of guitars, reproduces original tone without affecting the instrument acoustically, ultra thin, high gain before feedback, wide dynamic range. This model: for narrow saddle slot instruments, compatible with B-Band preamps only. Length: 2.2mm (3/32")