I think those are vector brushes.
not sure, lemme check
I'll link you in a min
I get most my brushes of Deviantart
link 1
https://r2010.deviantar*****m/art/myca...ack-1-74233279
Link 2
https://redheadstock.deviantar*****m/a...ushes-64718913
Link 3 The search page of Deviant searching on Vector brushes
https://browse.deviantar*****m/?qh=&se...ector+brushes#
Pretty easy when you know where to look