Used, adjustable trumpet braces. This allows you to add a brace to a trumpet that doesn't have one, or add a second brace to a trumpet with only one. Adding braces can change the stability and resistance of the sound, as well as improve the appearance. You can change the feel and tone by positioning them like a Bach or a Yamaha Chicago model. The screw mechanism allows for adjustment, so it can also be attached to the bell crook. If anyone is interested, please let me know. Thank you. m(_ _)m