I've looked at several different types of these sorters but I'm glad I found this one. All pens 1-4 have all 4 colors, not just one color per region. So the child has no association between color and count - it's more stimulating. Also, my son has thrown it from his high chair onto the stone floor a few times and it seems unbreakable! Finally, I like cute pictures on the base - beautiful.
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