.. to try and stop the hard plastic-hit-plastic when you close the lid? I believe this causes most of the cracks/damage that people have seen with their macbooks. the macbook has 2 horizontal bars on the lcd pannel, but it's hard plastic! Other companies have done the same with their devices. E.g. my Motorola razr has black rubber feet on the inside to stop the top/bottom from slamming into each other.