These are refills for the 3Doodler Start pen. My son blew through the plastic that came with his pen so we had to buy more. He wanted to buy individual color sets to get the colors he needed, but these mixed sets were all we could find. All colors look good together and he will use them, it would only help if packs of the same color were available on Prime. Because of this, this company has great customer service, so I wouldn't be surprised if they see this comment and then start offering single color refills with prime delivery. (We'd like brown and tan - hint, hint. :)
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