The Size 6 Bristlette Studio-grade Oil & Acrylic Flat brush uses white intermediate-grade, durable Taklon filaments that resist abuse, so it is ideal for use with oils and acrylics. Bright brushes are shaped flat on the end with a slightly thicker middle. Flats are similar to bright brushes, but the hairs are twice as long as the width. You can hold more paint with each brush stroke, and have more flexibility when creating long lines. Since 1905, Grumbacher has been a brand trusted by students, professors, art conservationists, and professional artists throughout the United States.