Yamaha YSL-897Z Tenor TromboneDesigned with world renowned trombonist Andy Martin, the YSL 897Z Custom Z trombone is perfectly suited for a wide variety of performance situations and features two interchangeable leadpipes named Z1 and Z2. Development Artist: Andy Martin The YSL 897Z was developed with Andy Martin, the world's finest trombone player. Balancer The new balancer found on the YSL 897Z perfectly proportions the instrument's weight. Interchangeable Leadpipes The YSL 897Z