Only advice is to be gentle while installing, dont rush and follow the guidelines in the video provided by manufacturer. the amazne product is geting worth every time this is not the first time i order from amazene they should have qualitty check . This is an issue with any rear mount seat. >_< My size 7. Such a simple, wonderful design. They wipe easily, though they dont really pick up dirt and dust much. Just be careful of stated responses. If you have no problems with heels, don?t hesitate on these beauties ? This will still have much better sound than the average, bass is heavy too.