它们是由橡胶制成的，能够增强在岩石上的摩擦力。
They have rubber synthetics that greatly enhance one's friction on the rock.
氧化铬5.2比重2.5莫氏硬度，增强摩擦力，因为高价格因而在世界的大多数地方不流行的。
Chromium Oxide Specific gravity 5.2, Moh hardness 2.5 Enhances friction, but not popular because of high price in most parts of the world.
以天然硅石灰和海泡石复合矿物代替石棉作为增强材料制备无石棉汽车制动摩擦片，可提高产品的各项性能。
Substituting compound mineral of natural siliceous lime and sepiolite for asbestos in brake friction lining can improve all performances of product.
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