The other day, we visited the percussion instrument professional manufacturer "KOROGISHA co. ltd." famous for marimbas and xylophones.
They make consistently the optimized sound plates from raw wood.
The president explained each process to us personally, and we toured the inside of the factory.
This is a sliced chip of wood at the time of processing sound plate for marimba.
I tried to hit it with a finger. It was a very good sound.