Advantages: good toughness, low friction coefficient of the ruby head, long life.

优点：有较好的韧性， 宝石头部摩擦系数低，具有超长的使用寿命。

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Low friction coefficient guides to ensure that the barrel weight fully to the mattress.

低磨擦系数导轨，保证滚桶重量完全作用于床垫上。

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And more significantly, it has very low friction coefficient and nice self-lubricating properties.

更有意义的是它具有超低的摩擦系数和优良的自润滑性能。

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The result is a tough material that has a low coefficient of friction comparable to that of Teflon and is highly resistant to abrasion.

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