Mizuno Maruichi's mahjong tiles "Yuri." The tile size is 25 x 18.5 x 15.5. While the "Yuri" tiles with yellow or green backs are readily available, those with "black backs" are rarely seen. The tile backs show some fading due to age, but there are no cracks, and the condition is excellent. In particular, because this is a version sold as "MVC mark," it uses a more glossy material than standard tiles. These are high-quality tiles from the Mizuno Maruichi brand with the "MVC mark," and are undoubtedly excellent mahjong tiles. The case has some rust due to age, but it should not affect use. These are extremely rare black-backed tiles, a collector's item that is rarely seen.