Yamaha YSL-891Z Custom Series Trombone Lacquer 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