The Wooster 4181 Willow is the firm-formulation Thin Angle Sash in the Ultra/Pro line, built with a purple nylon and sable polyester filament blend. The angled chisel trim and stiffer body give the brush enough push to cut a clean line under demanding conditions - heavy-bodied latex, cold paint, and rough trim - and the 2-1/2" width is the right pick for cut-in along wide casing, shutters, and panel work where coverage rate matters more than tight precision.

• Purple nylon and sable polyester filaments deliver a firm stroke with strong shape retention
• Thin profile reaches tight spots that a standard angle sash skips over
• Angled chisel trim for precise cut-in along edges and corners
• 2-1/2" width with 1/2" thickness for wider trim and panel work
• Compatible with both latex and oil-based paints
• Square, rust-resistant steel ferrule
• Sealed maple hardwood handle

Tip: Because the Willow is a firm brush, pre-condition with water (latex) or mineral spirits (oil) before the first dip and snap out the excess - the bristles will lay down a cleaner first stroke.