Its an X-Brace for a Tonewood Amp, Which is some kind of acoustic effects generator......
https://www.tonewoodamp.com/
Its a magnetic attachment.
https://support.tonewoodamp.com/supp...x-brace-video-
Its an X-Brace for a Tonewood Amp, Which is some kind of acoustic effects generator......
https://www.tonewoodamp.com/
Its a magnetic attachment.
https://support.tonewoodamp.com/supp...x-brace-video-