... Material: comply to RoHS, silicone or rubber (NR, SBR, BR, NBR,CR, EPDM, IIR, FKM etc)o Hardness: 8 to 95 ... , high quality and fast deliveryMaterialNR, SBR, BR, NBR,CR, EPDM, IIR, FKM SIR etc, eco-friendly,no-toxic.SizeAs customizedUsageElectronic, automobile, medicl equipment ... rubber moldsRemarkOEM & ODM products welcomed Silicone O-Ring/Seal/Gasket ,eco-friendly