The Wooster 9" Golden Flo 3/8" Nap Roller Cover is a roller cover used for painting walls. The "9 inch" alludes to its width, which allows for efficient coverage of bigger areas. The term "Golden Flo" most likely relates to the substance or quality of the roller cover, which indicates that it gives smooth and even coverage. The "3/8 inch nap" refers to the thickness of the cloth on the roller cover, which is a medium thickness ideal for semi-smooth to semi-rough surfaces. Overall, it's a versatile roller cover intended for common painting applications.