Mightlon Synthetic Filament Long Handle Brushes - For Acrylic. Black Pearl with Mightlon synthetic filament - a NEW material that is unique and only available from Silver Brush Limited. It will hold up to the most rigorous treatment with heavy bodied and tube acrylics. Black Pearl is recommended for use with Acrylic Colors, Oil & Water Mixable Oil Colors. I's ideal on canvas and large mural surfaces. Mightlon filaments are epoxy-set in polished seamless aluminium ferrules. Fitted to long matte black handles. The perfect brush for the value minded consumer. Round, Bright, Flat, Filbert, and Short Filbert.