Princeton Catalyst Polytip brushes are the most advanced in synthetic fiber technology. The tips of each fiber are split to replicate natural bristles. Polytip brushes are able to hold a high volume of paint, yet they stay responsive. These brushes are best used with acrylic and oil paints.Details: 12 sets (3 assorted brushes per set) Synthetic Polytip filaments Brass ferrules Birch wood long handles For use with acrylic and oil paintsSet Contents: Size 4 bright brush Size 6 flat brush Size 2 round brush