Dan Rožański has recently released a new pack which includes 41 various brushes and alpha masks for making the stones, rocks, surface, etc.
All brushes and alpha masks were originally created for AAAGames s.r.o. and and then released for sale.
All alpha masks are presented in 2048 resolution in PSD and TIFF formats and compressed as RAR file which gives the best result of compression. Alpha masks were tested in Zbrush, Substance Designer, Mudbox, and 3D-Coat.
Please note that repacking or reselling are not allowed.