For jobs that require extra strength, the newest and toughest of the Ultra/Pro line is Extra/Firm. NylonPlus filament, exclusive to Wooster, allows for superior stiffness and cut-in control. Able to maintain sharp edge even in hot, humid conditions. Made from 100% nylon. Very durable; cleans much more easily than brushes that use polyester to achieve extra stiffness. Round steel ferrule, chisel trim. Angle sash.
Wooster 4153 2″ Ultra Pro Lindbeck Extra Firm Angle Sash Brush