White synthetic brushes are the go-to tool in many artists’ brush vases. 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.