Yamaha YSL891Z Custom Z Jazz TromboneInterchangeable Leadpipes The YSL 891Z comes with 2 interchangeable leadpipes. NY Type (NY leadpipe) With a broad taper and a little extra length, this leadpipe passes plenty of breath for fortissimo passages and powerful performances. It features a soft, deep tone that easily fills large concert halls or outdoor spaces. LA Type (LA leadpipe) This leadpipe has a gentler taper and is a little shorter than the NY type, providing quick response and easy