Neptune is Princeton's thirstiest brush ever, delivering oceans of color to the sheet. Princeton is proud to offer Neptune in a beautiful range of shapes that includes hand-tied Mottlers and Quills. - Princeton Neptune Series 4750 Synthetic Squirrel Brushes- *Blick Exclusive* Set of 4Neptune Series 4750 Set, EXCLSV PRO BRSH 4 ST - Includes four synthetic squirrel brushes, one each of Aquarelle 1/4", Round 2, Round 6, and Round 10.