This contrabassoon plaque is bellied to allow for better support of the center of the cane while scraping or adjusting the blades.
Slips between the blades without distorting the edges.
The circular cutout makes precise placement easier. It can be worn as a necklace as well, we suppose. Probably dangerous though – do so at your own risk.
Measures 24mm x 55mm x 2mm.