What!!?? You mean it's NOT from Wagyu cattle, kept away from barbed wire to avoidscarring on the leather?
If they use Piano grade wood, ......surely the leather is, organic, cured when the moon is full, by 'Leather Masters' who follow on centuries old traditional processes.
(When I visited a Temple in Kyoto,it was HUGE..... it turned out to be 2/3rd the original size, rebuilt after a fire in 800AD!! They do things VERY properly in Japan)