These are "Jan-Oh" mahjong tiles. They feature "extremely thick tile backs," a "unique and beautiful curved back form," and a "wide, easy-to-hold tile width," as you can see at a glance in the photos. The tile size is 26 x 19.5 x 15.5 mm. There is almost no sign of use, and there are no scratches at all. I think the condition of the tiles is superb. The "green-backed Jan-Oh" is quite rare these days. The "Jan-Oh logo on the one-pin" and the "piled-up appearance" are very cute, like an eraser.