Rubber material is the most important feature
High elasticity (elastic, this is not an ordinary) is a feature of all have rubber, rubber material is the most valuable features, and only have the characteristics of rubber materials, the use of rubber are occasions, because it has high elasticity.
Like Chinese people, as long as they are Chinese, they have dark eyes. If he is blue eyes, he must not be chinese. As for other differences, that is the difference between different parts of china!
As for the temperature, oil and so on, is different between the characteristics of rubber.
