Cool Wind CTB-200 Series F-Attachment Trombone Black Tuning: Bb/F (Trigger) Bore: 0.547" (13.90 mm) Material: ABS Mouthpiece material: ABS w/Brass leadpipe Bell material: ABS Bell size: 8.5" (216 mm) Slide Material: Carbon Fiber Case : Soft Gigbag Plastic brass instruments have been in the marketplace for a few years now First there were plastic trombones, then plastic trumpets Manufacturers are taking what theyve learned and applying it to more ambitious designs such as the plastic&nbsp;F-attachment trombone Cool Winds is at the forefront of this design and manufacturing revolution