Mack Brush Series 1992 Soft Flat Stroke Brush Superior Lettering Brush This Soft Flat has a very clean edge with excellent control. You can letter very quickly and it lays out paint beautifully. This brush is typically used for larger lettering and production lettering. It can be used as a fill-in brush and out-liner brush for larger letters. I found that these lasted longer and helped me make a transition to synthetic blended brushes. Individual Brushes LISTED BELOW!