Shur-Line 55535N 2-1/2-Inch Angle Sash-Poly Premium Select Brush 100% chemically tapered Polyester for the finest finish & faster coverage Polyester for improved resiliency & Durability Ordinary pet Polyester & nylon filaments lose some resiliency in humid conditions 2-1/2-Inch angle-sash Better coverage, easy clean up and up to 30-percent faster projects speed 100-Percent chemically tapered filament-for precision accuracy High quality polyester filament-for ultimate durability and performance with all paint types Stainless steel ferrule-rust resistant