The cover for the integrated pointing stick may come off or get worn-out when running your hand across the keyboard. The pointing stick covers are meant to replace the old worn-out cover of your laptop's pointing stick. To replace the cover, simply push the cover onto the end of the square-shaped stick, and press down firmly. This product have been tested and validated on Dell™ systems and is compatible with Dell Latitude™ D420/ D630c/ D630N/ D631/ D631N/ D820/ D830N Laptops. It is supported by Dell Technical Support when used with a Dell system.