... .1xID50x1.45mmThickness Flat silicone ring gasket for ceramic pots with one air hole1.Material: 100% silicon material, soft and stretchy, 40shore ... , SBR, EPDM, CR, Silicon, FKM, Neoprene, etc.4. All food grade silicone production process confirmed by ISO9001, and ROHS approve5.Color ...