1>material:alumina and carborundum 2>size:different size.such as 40x40x20mm 10 or 20PPI 3>packing:carton. foam ceramic filter for high tempreature molten metal, gas,catalyst substrate,solid heat exchanger,special packing.can filter very small impurity, even micron. three dimensional structures can change turbulent current liquid into stable flow, after venting gas, can be molded gently, improve ...