Kaiyo Mizunara Oak Japanese WhiskyKaiyo Mizunara Oak Japanese Whisky Kaiy whisky is matured in the finest Japanese Mizunara oak casks. These casks are handmade. due to Mizunara oaks delicate wood grain. They are among the rarest casks in the world and are. considered the finest in which to mature whisky. After years of maturing our casks go on a final. 750ml glass bottle 43% ABV