A eraser fan suggested that you can take the Black and White Iwako Cow and combine it with one of the colored cow Japanese erasers, you can create a all white cow Japanese eraser. In the picture, we took the white back of the Black and White Cow Japanese eraser and replaced the pink back, creating a all white Iwako cow eraser.
When the White Hamster Iwako Japanese eraser
and the White Horse Japanese eraser become avavalible, you will be able to start your own 
white eraser collection.