These Pro Arte Prolene Synthetic Brushes are part of the high-quality Prolene collection of synthetic watercolour brushes. They have incredibly soft fibres which feel closer than ever to natural sable, but with all the durability (not to mention the lower price) of a synthetic brush. They are a joy to paint with, and they are beautiful looking too, with ferrules in gold plate and teak handles. The Series 9A is the sword-shaped liner version of the Pro Arte Prolene Plus Synthetic Brush. Its perfect for creating long, very fine lines, and many artists recommend it for painting foliage. The Pro Arte Prolene Synthetic Sword Shaped Liner Brush Series 9A comes in three sizes: small, medium and large.