Flat Synthetic Brush (Pack x5) (Green Stuff World)Flat Synthetic Brushes There are countless types and sizes of brushes, each designed to fulfill specific functions in modeling, scenery building, or technical maintenance tasks. Green Stuff World's large flat synthetic brushes are handcrafted with high resistance synthetic fibers, specially selected to withstand the most demanding painting products. While not intended for fine miniature detailing, they are widely used due to their size and versatility