We bought these macaroon Iwako Japanese erasers from a ebay seller based in Japan. The colors of the macaroon Japanese erasers are colors we had never seen before either from Iwako Japan or from the US distributor of Japanese erasers.
When we opened the package, the macaroon Japanese erasers were lose and not in the Iwako package that the Japanese erasers normally come in.
We queried Iwako about these rare colors and they told us they are a series of unique colors they make as year end gifts for Japanese distributors of Iwako Japanese erasers. Next year they will send a series of rare colors of some other Japanese eraser to the US based distributors.