D. This is rubber friction, which contains cords. It's the fresh rejected material during the tire production but it is Unvolcanised. And it's compressed in bales.

含绳层的耐摸生胶，轮胎生产未经加工过的废弃品，经过硫化，并扎成整捆件。

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They have rubber synthetics that greatly enhance one's friction on the rock.

它们是由橡胶制成的，能够增强在岩石上的摩擦力。

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With special raw material (raw rubber bearing) and small friction coefficient; electricity -saving.

含特殊原料原橡胶轴承，摩擦系数小，更省电。

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Then there's the Slide (pictured above) which relies on interesting physics to support the iPad: a heavy high-friction rubber cylinder is pulled out of its tubular compartment under the metallic slope, and it can be placed anywhere on the slope to support the iPad at any desired angle, up to somewhere around 70 degrees -- you can see it and the others in action in the earlier video.

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Another major difference is that Palm's dock uses magnets to line up and secure the handset, and LG's accessory relies solely on the friction between a rubber ring and the glass back of Google's flagship phone.

ENGADGET

The intense friction degraded some of the replaceable rubber grips.

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