Wooster Brush R295-4 Wooster 50/50 Roller Cover, 1/2-Inch Nap, 4-Inch Shed-resistant cream-colored knit fabric blend of 50% lambs wool and 50% polyester for 100% performance For use in all flat satin or semigloss paints stains and waterproofing Wool provides maximum paint capacity and a smooth finish and the polyester resists matting Clear single-ply polypropylene core For semi-rough surfaces