Kawada to you by diamond block, "nanoblock (nano-block)" mini-size block of astonishment.
In one mini size of 4mm slightly raised dot size is half the size of a conventional diamond blocks.
The size has inherited all the features of the diamond with even half a block, not function at all inferior.
Please try a new hobby precise material unique to Japan full production.
Hobby items can be immersed completely new adult form but a normal block.