LefreQue sound bridges improve the tuning and performance of all Woodwinds & Brasswinds. Ideally windinstruments would consist of one uninterrupted tube. For practical reasons (tuning, size, technical constraints), they have joints. LefreQue is a revolutionary sound bridge that improves the transmission of sound over these joints. The result is an unequaled improvement of sound quality: purer overtones, accurate tuning, clear response, smooth intervals, extended dynamics and surround projection.