Lenovo, and previously IBM, manufactured magnesium alloy chassis and roll cages for the Thinkpad line of laptops. I personally have a couple. It's an interesti

Lenovo, and previously IBM, manufactured magnesium alloy chassis and roll cages for the Thinkpad line of laptops. I personally have a couple. It's an interesting material, it's very stiff and light, usually with a dark gray color and a sort of chalkboard-like texture.