YSL-891Z Custom Series Trombone Lacquer. The Yamaha YSL-891Z Custom Series Trombone was developed with famed trombonist Wycliffe Gordon and Andy Martin. The YSL-891Z featues a .508-inch bore with two interchangeable leadpipes--the NY leadpipe is longer and was developed with Wycliffe Gordon while the LA leadpipe is shorter and was developed with Andy Martin. The lightweight design of the YSL-891Z makes this an excellent instrument for jazz and commercial work. The Yamaha YSL-891Z Custom Series Trombone includes a case and mouthpiece and is available in lacquer (YSL-891Z) finish.