Good performanceof silicone stopper:1.Silicone stoppe is made of silicone,environmental-friendly ,safe ,durable, 2.Silicone stoppe has high/low temperature-resistant, wearing-resistant, high tensile strength, all availableSpecification of silicone stopper: 1.100% food grade silicone material,nontoxic to humans body,with environmental protection or SGS silicone. 2.Unbreakable, pliable, and not ...