Grinding sponge, aluminum oxide dispersed on 4 sides, 100 x 70 x 26 mm, corundum, a narrow side and a wide surface in a single grain, double grain for sponge, carrier made of extremely flexible polyurethane foam, synthetic resin used dry. The friction can be rinsed. Long service life, especially suitable for sanding surfaces. To remove rust, paint. For cleaning and sanding synthetic resin varnish, acrylic varnish for painting. Good for sanding window and door frames before painting.