These are a new addition to the range. I designed the Pure Sable Domed Filbert with the oil artist in mind who requires a 'fuller' body to a filbert and a nice domed shaped head rather than the 'cats tongue' style which tends to be more pointed. These have proved popular in both oils and watercolour. For oil artists many use the Series 81's for the finer detail such as in figurative work, around the nose, lips and eyes etc.