The Black Pearl series of brushes features Silver Brush Limited's new Mightlon synthetic filament. They are great for use with all media, including oil, acrylic, and water-mixable oil color. Mightlon, an exclusive of Silver Brush, is a synthetic replacement for hog bristle. It is ideal for heavy body acrylic paints because the fiber performs like bristle, yet does not soften in water-based media. The satin black handles are fitted with seamless aluminum ferrules, creating innovative brushes at an outstanding value.