Edwards Tenor Trombone Slide Purchased from Adam Rainey of the Detroit Symphony Orchestra. Stamped "TBCR," the specifications are as follows: Outer Slide: Rose Crook: Nickel, Round (Cone Type) Rubber Bumper: New Type It's similar to an AR slide, but with the crook replaced with nickel. This is just my personal impression of the playing experience. Perhaps because Rainey is a bass trombone player, the breath flows very well. Despite this, the tone doesn't become overly open, and it feels easy to maneuver. The slide action is also very smooth. Please purchase only if you agree with the condition shown in the photos.