Princeton Ashley, Brushes for Acrylic and Oil Series 5200, Interlocked Chungking Bristle, Round Size 6 Traditional natural hair, pure hog bristle. Ideal for oil color painting but can also be used with acrylics. Best value Chungking Bristle Perfect for both students and amateurs The round is a classic painting brush used for everything from flora and still lifes to portraits and landscapes  just about any subject matter in any style. Larger rounds can lay in large areas of color and stroke specific shapes, while smaller rounds are used for detail.