Use these synthetic mongoose brushes with oil, acrylic, and water-mixable oil colors. Monza bristles are ideal for blending and offer the artist precision control with sharp edges and fine points as well as superior spring, bounce, and durability. Bristles are fitted into seamless aluminum ferrules. Brush sizes - The length and width of a brush of a given shape and size may vary by manufacturer as brush sizes are not standardized. Since fine art brushes are handmade, expect some variation even among brushes from within a single brush line.