The return of Balvenie Tun..! Batch 2, we see a combination 32 casks - 23 traditional American oak barrels and 9 European sherry oak casks... Transferred and matured for several months in Tun 1509 which holds 4 times as much liquid as Tun 1401. Batch 2 has been bottled at higher strength of 50.3% vol.