This sponge holder suction cups has an open design that allows for easy cleaning. Allows water to drain quickly and dries your sponges quickly and hygienically. 1 compartment for sponges or scrapers, 2 sturdy suction cups attached to the sponge; The smooth surface of the sink is matte black with rust-resistant Thermobond coating and is made of durable steel. Extraction works best on non-porous surfaces (fiberglass, glass, polished tiles, etc.). The suction effect also does not work as well on more porous surfaces such as textured tiles, mosaic tiles, wood, concrete, etc. Also, you should avoid wrinkles when attaching the suction cups, as these may not allow for smoothing out so that the suction cup clicks into place properly.