... ±3 shore A toleranceo Color: for rubber, usually black, for silicone and EPDM, can be in any color as you wanto Product scope ... , SBR, BR, NBR,CR, EPDM, IIR, FKM SIR etc, eco-friendly,no-toxic.SizeAs customizedUsageElectronic, automobile, medicl equipment toys and so ... 30days, especially for some automotive rubber moldsRemarkOEM & ODM products welcomed Silicone O-Ring/Seal/Gasket ,eco-friendly