This is an edge effector for a small shank mouthpiece. The manufacturer is unknown. Weight: Approximately 100g Diameter: Approximately 30mm Length: Approximately 30mm Made of brass. No plating. Depending on the mouthpiece, it may not be possible to attach it. It cannot be attached to a large shank. *The mouthpiece in the photo is Yamaha. Please note that the mouthpiece is not included. Edge Effector Weight Balancer Trombone Tenor Trombone Tenor Bass Trombone Small Shank