Forgot which Brush I had used

Hi there, I was wondering if anyone is able to help me figure out which brush I used, I currently was trying to find the brush with no luck, I've tried the history but couldn't find it . It may be a Kyle brush but I cant, find anything exactly like it. It would lay colour harshly so I would change the opacity to make a slight blend between colours, in the top preview it was both rectangle and positioned horizontally.

Thank you so much, if anyone could help!