The ThinkPad roll cage protects the system's internal components from bumps and knocks and minimizes system board flex
You work hard and you want your data to be safe on your laptop PC, even if you drop it.
Continuing the ThinkPad legacy for making tough devices, ThinkPad roll cages are made of incredibly strong and light magnesium alloy, or in the case of the ThinkPad X1 Carbon, carbon fiber, which provides maximum strength with minimum weight. It protects the system's internal components from bumps and knocks and minimizes system board flex that can weaken solder joints. The roll cage also provides a rigid chassis for the ThinkPad's hinges and outer shell.