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The Size 1 Black Diamond Oil & Acrylic Flat brush features an unbleached, undyed, natural black hog bristle that is slightly more flexible than a traditional Chungking hog bristle. These bristles are interlocked with natural flags for sharper edges and better color lay down. The non-slip, soft black handle offers better brush control and reduced hand fatigue. 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.