Winsor & Newton Monarch - Short Flat / Bright - Just the brush
Amazon.com: One Inch Flat Bright Paint Brush, Pack of 4, Premium Quality Synthetic Sable Hair for Acrylic Watercolor Oil Gouache Painting by Students, Professionals and Artists : Everything Else
Brush Shapes: Flat VS Bright – THE SILVER BRUSH BLOG
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Robert Simmons Signet Brush Series 40 Bright 4
10 Flat Brush (3-8'') – Graftobian Make-Up Company