Official Japan Sumo Association nanoblock sets imported from Japan. Now you can have fun assembling your own tiny Kokugikan or Yokozuna.
For those not familiar with nanoblocks, they are micro sized building blocks. Two different sets are available. One set has all you need to build a model of the Ryogoku Kokugikan while the other is a Yokozuna demonstrating the Shiranui style dohyo-iri ring entering ceremony stance.
The Kokugikan set has 360 pieces while the Yokozuna set has 170. Picture instructions are included. The smallest block is 4x4x5mm. The completed Yokozuna is about 5cm (2") tall. Intended for ages 12 and over and a hazard for those under 4.