Harley Benton Parts Feedback Buster Matrix

it is hard to tell if this is real wood or a synthetic composite, but it looks like real wood and fits perfectly into the 102mm hole of my 80s Yamaha acoustic. It has foam rings and is just a push fit, so it won't damage the guitar as long as you are careful. It suppresses howling feedback just enough without muffling the guitar and making it "boxy". My only criticism is that the edges of the ornate patterned holes are quite sharp, but it would be impossible to make this perfect at the price.

Very beautiful feedback buster (if it fits to your sound hole)