This is a genuine main tuning slide for a Getzen 3047AFR trombone, an American instrument maker. It is also compatible with Edwards trombones (some adjustments may be necessary depending on the model). I am selling this because I recently purchased a red main tuning slide and no longer need this one. I get the impression that this slide produces a more focused sound than the red one. There are scratches and lacquer wear from use, but it is still perfectly usable. This is a rare item, so don't miss this opportunity! Please feel free to ask any questions in the comments.