White synthetic brushes are a core brush for acrylic painters Series 6100 has a soft flexibility that is perfect for low to medium viscosity paint For heavier bodied acrylics and oil paint we recommend the 6300, and 6400 series, both with firmer tufts White synthetic will still be very effective for blending and smoothing these heavier media A filbert is a brush shaped like an oval at the tip and is tapered to a chisel edge. The shape of a filbert makes it useful for basecoating round or curved areas, applying washes and painting flowers This Filber size 6 Summit White Synthetic Artists Brush by Princeton is a core brush for acrylic painters. The 6100 series has soft flexibility that is perfect for low to medium viscosity paint and is very effective for blending and smoothing heavier media as well. Each brush features a nickel-plated brass ferrule, precision tapering and a luxury synthtic blend that is designed for oil and acrylic.