New in box. Nanoblock Japanese battleship Yamato. Nanoblockis an amazing mini size block delivered by Kawada, a diamond block. Its size is a mini size with one potch of only 4 mm, which is half the size of a conventional diamond block. Taking advantage of its small size, it is possible to create small parts that could not be expressed by a block of general size. Even if it is half the size, it inherits all the features of the diamond block, and its functions are not inferior at all.