BREAKTHROUGH TECHNOLOGY—The Catalyst series features paintbrushes with synthetic bristles where each individual fiber has been split to replicate the natural flags on the finest natural bristle ADVANCED POLYTIP BRISTLES—Each fiber has two to three distinct tips, allowing the brush to hold a high volume of paint while providing a smoother application and better control BETTER THAN NATURAL BRISTLES—Unlike natural hog bristles, our artist paint brushes offer real integrity, maximum stiffness and the best color holding capacity and shape retention. MADE TO MOVE PAINT—Catalyst brushes are designed for use with medium to heavy-bodied acrylics and oil paints. They can even push heavy gel mediums with assurance.