The Pro Arte Prolene Plus series 007 round watercolour brush size 8 represents a pinnacle of achievement using a wide variety of Prolene synthetic filaments which are ferruled in beautiful gold plate & fashioned with teak handles. The brush has an excellent spring, points easily & holds colour well. Probably the closest any man-made filament brush comes to sable. The Pro Arte Prolene Plus series 007 size 8 round watercolour brush is excellent for detail work as well as fluid watercolour applications.