Jumbo Pumie Scouring Brick for the tough jobs. Works through abrasive action using water or your favorite cleaning liquid. Excellent for removing: baked on food, grease and carbon build-ups in ovens or on grills, rust and grime on machinery or tools, scale and rust on metal, paint on tile, masonry and concrete surfaces, lime and algae on ornamental and swimming pools, and mineral deposits around faucets and drains. Non-toxic pumice, large project size. 5-3/4 In. L. x 2-3/4 In. W. x 2-3/4 In. H.