This is a Yamaha tenor trombone with a bass trombone slide. It has a large bore and an F-attachment. The slide and rotary valve move smoothly. The tuning slide and F-attachment slide are removable. The mouthpiece is a Yamaha 51 (large bore). It comes with a hard case that has some damage, as shown in the photos. The instrument body and slide also have considerable wear and tear, but it is still possible to produce sound normally. The cork on the water key and the rubber bumper have been replaced with new ones. It will be shipped via anonymous Mercari delivery.