With the advantage of anti-corrosion ,anti-acid , pressure-proof, and easy-cleaning , Zhongguang products are the best choice for the users. The specification of Zhongguang products include the following sizes(mm): 150*150*15/20/30; 200*200*15/20/30; 230*113*65; 300*300*15/20; 150*75*15/20/30.