Erase Away™ cleaning blocks wipe away dirt without the use of expensive cleansers. Just moisten block with water, and gently rub away dirt and grime. Erase Away™ works safely on most surfaces - counters, windows, walls, bathroom fixtures, patio furniture and more. You get 16 large (4¼” x 2¾”) and 16 small (2¼” x 1¼”) blocks that are reusable, environmentally friendly and economical. Keep them anywhere a cleanup is needed! Made of dense microfiber foam.