1,Approvel : ISO9001:2000 metal raschig ring 2,Material :SS304 3,Size :16mm,25mm,38mm,50mm,76m 4Good ... are available in a wide range of carbon and stainless steels.Technical dataSize(mm)Bulk density(kg/m3) ... material stainless steel (AISI304) in the material thickness shown. Other material available: carbon steel, stainless steel including 304, 304L, 410,316, 316L. stainless steel raschig ring