Iwako Japan, from time to time, will do a limited edition minor color variation of a existing eraser. The front row of penquin Japanese erasers are current stock. The back row is a set of penquin Japanese erasers are slightly different shades than their close cousins in the front row.
As a retailer and collector of Japanese erasers, we would like to see Iwako do something different for colors when they do limited edition Japanese erasers. Changing the color of Japanese erasers by a couple shades is just, well, meh.
The design of the Iwako erasers are the best of Japanese cute. Why can't they show the same imagination in colors for the limited edition erasers?