Take the Best with You! Our Travel Brushes let you create your artwork wherever you are. Princeton Neptune Synthetic Squirrel Brushes are Princeton’s softest and thirstiest synthetic brushes. Featuring the latest synthetic fibre technology, the Neptune range has multiple-diameter filaments, which are configured to replicate the smooth feel of natural Squirrel, with enhanced snap and resilient strength. When Princeton set out to create Neptune, a synthetic version of Squirrel, the company developed a brush that may actually outperform the natural version. Experts in natural hair brushes have been have been incredulous that this is actually synthetic Princeton Neptune Synthetic Squirrel Brushes are soft and supple with an even release of colour. It delivers oceans of colour, that is, it has great colour holding capacity with even flow. Princeton offers Neptune in a beautiful range of shapes including hand tied mottlers and quills with rich wood tone handles and sea glass aquarelle handles.