100 sq. in. of cleaning surface plus "heavy accumulation" scraper, Contoured V-shaped 1 1/2" brushes clean sides, front, back and soles. Soil directed downward. One foot secures unit while the other is cleaned. Structural foam blocks, 3" x l 1/2" x 10", are held in place by steel swivel brackets bolted to all steel frame. Plastic bristles are "Soak-Proofed," acid and weather resistant. Ideal for indoor or outdoor use.