... and shape:according to your need 3)passed ROHS rubber wheel stopper CertificateISO9001:2000,ROHS,SGSTemperature range-40°C- ... air,water,and dustTypeSolid rubber seal,sponge rubber seal,hollow rubber seal and composite rubber sealMaterial100% made of the SGS grade silicone rubberCharacteristics Flexibility and ... stopper,bottle stopper,bottle stopper,bottle stopper,bottle stopper, rubber wheel stopper