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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.
Left side ports
The ThinkPad X1 Carbon has a surprising number of ports given its thin profile. On the left side of the laptop:
L-R: Power/dock; HDMI; mini-DP; USB 3.0; Audio