This is the Ichikawaya collaboration luxury mahjong set, "Touhou Mahjong Pai Kyokuto." Each tile features a stunning character design, and you'll be amazed by the intricate craftsmanship when you examine the details. The tile size is 26 x 19.5 x 16.4mm. It's in brand new, unused condition & still sealed, having been kept as a collector's item, so it's in perfect condition, just as it was when it was sold. The cobalt blue tile backs are beautiful and incredibly cute! It's unlikely that a set with blue-backed tiles in brand new condition will appear again. ※ The last six photos are images of what it looks like when opened. ★Notable Points★ This is the blue-backed version, which was sold as a "100-set limited edition" at Comic Market 74 in the summer of 2008. It seems that it was also sold in limited quantities through mail order and at Ichikawaya, but it quickly sold out and is a rare item. It's a dead stock mahjong set that is no longer sold.