Synthetic brushes are man-made of either nylon or polyester filaments. They can be tapered, tipped, flagged, abraded, or etched to increase color-carrying ability. Often, synthetic filaments are dyed and baked to make them softer and more absorbent. The common name for this filament is "Taklon."
Advantages of synthetic brushes over natural hair brushes include:
1) They are less susceptible to damage from solvents, paints, or insects.
2) They are easier to keep clean because the filaments lack scale structures that can trap paint.
3) They are durable and less prone to breakage on a variety of painting surfaces.
4) They are better suited for use with acrylic paints because of their ability to withstand the caustic nature of acrylics.