The polycarbonate surface is resistant to wear from normal use, however the amount of pressure each player uses is extremely subjective. If you drag with excessive pressure, the friction created will always lead to wear for both the pen nibs and your tablet cover. As such, if you drag hard enough to wear the polycarbonate surface, you must treat the covers as consumables.It's recommended that you regularly change your pen nib as well as shift your active area to different locations if you are one of the few players that uses their covers enough to cause any wear.A bit more info on the surface can be found on the product category pages.