The Pro Arte Acrylix Brush Filbert Series 205 comes with Pro Arte's special Acrylix bristles, developed as a synthetic alternative to hog hair. The bristles are firm yet flexible, with a silky texture which they'll retain even after lots of use. They are a delight to paint with, last for ages and are also less expensive than hog hair, so it's easy to see why they are so popular with artists working in acrylics and oils. The Pro Arte Acrylix Brush Filbert Series 205 comes in a range of sizes to suit all purposes.