Wooster Brush R296-18 Wooster 50/50 Roller Cover, 3/4-Inch Nap, 18-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 Green double-thick polypropylene core resists water solvents and cracking For rough/semi-rough surfaces