These high-performance brushes may be used with both oil- and water-based paints thanks to its exceptional Solid Round Tapered (SRT) filament combination. This blend improves pick up & release, reaches the Goldilocks zone between stiff and soft, and leaves a very smooth finish. The strong grade stainless steel ferrule increases rust resistance and longevity. For those who prefer a fuller sensation after the brush expands in the hand while working, the handle has a non-varnished finish.