The #6 Fan Brush may be used to make clouds, mountains, tree trunks, foothills, boats, soft grassy areas and many other beautiful effects. The Bob Ross landscape brushes are special brushes made from a blend of natural and synthetic bristles and shaped according to Bob's very precise specifications for the Bob Ross Wet-on-Wet Technique. Remember, ordinary brushes are not the same and can't create the same beautiful effects these will.