Yamaha YSL872 Alto Trombone with Trigger

Alto trombone in Eb with trill valve and D & C# slide, developed with Larry Zalkind. -Basic specification refer to YSL-871 -Yellow brass one piece bell -Nickel silver outside slide -Bore size: 11.95-12.45mm (0.470-0.490) -Bell size: 181.8mm (7-1/8)