Connoisseur Pure Synthetic brushes have heavy duty bristles with unsurpassed strength and spring for any thickness of oil or acrylic paint. They do not leave scratchy indentations in the paint like hog bristles. These have enough power to easily move even the thickest oils right out of the tube, and the interlocking fibers provide excellent paint carrying capacity. Oil painters should consider cleaning these with walnut oil instead of solvent to preserve their smoothness and shape. Acrylic and oil painters alike can also use Masters Brush Cleaner to preserve the bristle quality. Four shapes are available in sizes 6 and 8: Flat, Bright, Filbert, & Round.