It's made of synthetic rubber, which is a type of plastic.

它是由成橡胶制成的，它是一种塑料。

Although some gums today still use plants, most recipes today now use synthetic rubber mixed with sugar and other flavorings.

尽管今天有些口香糖仍在使植物，但如今大多数都使的是成橡胶与糖和其他调味料混而成。

JSR started out by specialising in synthetic rubber.

JSR 最专于成橡胶。

They're made with a combination of proprietary synthetic rubber compounds, which are paired with aluminum steel reinforcements and nylon and aramid fabrics.

它们是由专成橡胶化物与铝钢增强材料以及尼龙和芳纶织物组而成的。