I have a yinhe pro feeling, 87 gramms.
Top ply is KOTO (i have fishscale pattern - only koto has this - same as my bty timo boll ALC - not like Limba from my BTY IF LAYER ALC)
Second ply is unknown to me.
Then a 'VOLCARYL' Layer consisting of Basalto Fiber (russioan high strength fiber made...