PX® 100% Solid Round Tapered (SRT) Polyester/Nylon filament 1-1/2" Rattail Angle Sash Brush. A precise formulation of SRT polyester and nylon assures smooth application, for greater paint pickup, paint release and area coverage per stroke. Guaranteed set in epoxy, sanded wood handle, tipped and flagged filament, and satinless steel ferrules. Formulated for todays Low VOC paints.