I have a cheap set from Michael's. I stopped using them for splatters when I put some old pages in albums and the splatters smeared. I now use distress inks only for splatters.
I have these sets. I use the brushes for coloring stamped images. The koi set is more for drawing or painting. To mix and blend well, watercolor paper is a must .
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I have a couple of sets...not sure how good they are. I won one and was given the other (from Michaels) as part of a class from Amy Tan. I don't use them much.