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Lay it out flat
The screen can be pushed back 180 degrees for using flat on a table.
Carbon fiber goodness
The top of the X1 Carbon is constructed with carbon fiber, making it stronger than aluminum.
Magnesium aluminum alloy on the bottom
Carbon fiber is used on the top of the X1 Carbon, and a magnesium aluminum alloy on the bottom casing. The combination is what makes the laptop so durable, while keeping the weight down.