Hair: Red sable Shape: Round Size: 6 Diameter of ferrule: 4mm Bristle length: 17mm Features: Round, for detailed work Notes: The shape of the brush tip is similar to the Series 8383, but while squirrel hair lacks resilience, red sable hair has excellent elasticity. This is a new, unused item. It has been stored unopened since it was purchased new. The price tag is attached to the brush protection bag, but please understand that it is the old price. I am also selling watercolor brushes, so please take a look if you are interested.