Silver Brush 2503-4 Ruby Satin Long Handle Synthetic Brush, Filbert, Size 4 Ruby satin long handle synthetic filament filbert shape brush Simulates the high performance of hog bristle and mongoose hair brushes for acrylic painters with longer lasting interlon filaments Used for water mixable oils/oils and acrylic color Color control with extra heavy bodied tube, or jar acrylics For use with oils, encaustic or casein