I saw them when I was shopping for equipment and got curious. The sales clerk saw me looking at it and I ask her what it is for. Its a specialty brush. She said it was for making some even pattern when people are doing abstract painting or encaustic painting?. She mentioned bees wax and she lost me
. She's an artist too and she showed me using the brush layering different color on top of another. When she stopped midway and paint ran out it created uneven pressure and it gave me an idea. I bought the small one and tested it. It worked. Thought it was easy to replicate, out of an old brush.