This is a holder for attaching a pencil to the tubing of a French horn. It may also be possible to attach it to a trumpet, but this has not been confirmed as there is no actual instrument to test with. Please check the size. Two pieces will be sent as a set. *Pencils are not included. Size: Approximately 2.5 x 1.2 cm This is a no-brand product. There may be some size variations. If you are looking for perfection, please purchase a branded product. We are not responsible for any problems that may occur during use. It will be sent in simple packaging.