Billed as the smallest dice in the world, each one measures 0.3 x 0.3 x 0.3 mm (for perspective, see the photo above showing one of the die next to a 0.5-mm diameter mechanical pencil lead). The tiny dice are painstakingly crafted one by one from BsBm (brass) in a 9 hour long fabrication process that relies on the latest in micromachining technology. Each one weighs 0.00016 grams and the pips measure 0.05 mm in diameter. While the 100,275 yen (US$870) price tag includes a special case and the cost of shipping, it does not include the price of the microscope you will need to make sure nobody cheats at the craps table in your flea circus casino.

Source: Tanomi.com