Ultra/Pro Mink Firm, 3", Nylon/Polyester Formulation, Flat Sash Brush, For All Coatings, Firm Formulation, Consistent Control, For Painters Who Prefer A Straight Working Edge For Window Frames, Moldings, & Other Trim, Blended Purple Nylon & Sable Polyester, Provides Excellent Paint Capacity For Better Coverage With Less Effort, Use With All Acrylic, Latex, & Oil Based Paints & Enamels, Treated Maple Wood Handle.