NATURAL STONE ROOM HUMIDIFIERS SET 2 This pair of room humidifiers naturally restore moisture into the dry air in your home. Simply fill the black ceramic bowls with water, and the white porous clay balls will absorb the water and release moisture into the air through natural evaporation. No electricity required. No Noise, Stylish décor, looks great in any room Significantly improves the air quality in your home, especially during dry winter months. Large is 4 1/2" Dia., Small is 3 1/2" Dia. GUC-No Chips or cracks. Water calcification marks can be seen on the inside-see photos for details Bundle your likes and SAVE! Pay ONE shipping fee on several items GS