NOTE:The brushes are coated at the factory to keep the bristles stiff which helps to protect the hairs in the brush during packaging/shipping. Coating will wash off bristles and/or gently moving bristles around will loosen them up and not cause harm to the brush. This is a standard process in brush manufacturing. Art Advantage twenty-four piece brush set. Long handle brushes are perfect for both oil and acrylic to use with a free canvas brush roll-up. Twelve white nylon brushes and twelve sturdy hog bristle brushes. Each set has one of each flat and round in sizes #2, #4, #6, #8, #10, #12 in both synthetic and natural bristle.