type/ spiral wound with outer compression limiting ringmaterial/ asbestor fillers s-s-316 metal zinc-plated carbon steel guide ringtemprature/ to 540 deg.c (1000 deg.f)thikness/ gasket 4.45 mm guide ring 3.16mm standard/ asme B16.20(API 601 )EQUAL TO JOHNS MANVILLE STYLE 913FOR CLASS 600 FLANGE (RAISED FACE ) NOM.PIPE GASKET CENTERING RINGSIZE IN O.D I.D OUTER TYPE INNER TYPE 2 IN 85,7 69.9 111.1 PLEASE SEND US YOUR PRICE FOR 6 PIECES