This Multi-tite gaskets ( tite service weight gasket) is 4 inch, other size is: 2 3 5 6 8 10 12 and 15 inch Material base customer requirements: Neoprene EPDM NBR Meets ASTM standard C564 For connecting bell & spigot cast iron pipe, easy to install Yours faithfully Wang Jun General manager Ningbo Jiangdong Grommet Rubber : No.762, zhongxing road, Ningbo, CHINA 315040T:0086- F:0086-E:sales@; nbrubber@://