The double-wing design ensures maximum cleaning action on tough dirt, even in difficult-to-reach corners. 8-inch two-level hand scrub brush. 8.25 inches two-level scrub, Polypropylene block, filled stiff Polyester. This is a most effective heavy-duty hand scrub. By pushing down hard during scrubbing action, the filaments at the ends of the brush splay out, getting into hard-to-reach corners. The block has a comfortable grip.