Aqua Elite Round Synthetic Brush Kolinsky Sable Brushes have long been recognized as the standard of excellence the comparative benchmark of how other natural and synthetic watercolor brushes perform Aqua Elite is an innovative synthetichair paint brush that is indistinguishable from natural Kolinsky yet significantly more affordable The performance of this new synthetic hair brush technology makes Princeton Aqua Elite the new standard for discerning watercolor artists Specifications. Size Size 50