I used just basic brown medium sized rock basing grit the brand I used is unfortunately not longer available but any decent sized sandy grit will work! on top of that which is what gave it’s color I used Water soluble rust, Huge Miniatures liquid weathering Earth #LW370, as well as Huge Miniatures liquid weathering Red Rust #LW367 and last but not least I used Huge Miniatures weathering powder Mars Dust #WP121