OK I'll play devils advocate. Coils covers are overrated. The can be difficult to place and remove, they can hold debris between the coil and cover, they can add unnecessary weight to your detector, ect. I have used several detectors over time and have used coil covers and have gone as manufactured. I have never broken a coil or worn through the original covering. Having said that, I have seen some guys abuse their equipment, crack their coils, grind through coverings by unnecessary rubbing on rocks, ect. Some people reduce their cars to junk in two years, some people wear out their shoes in six months. Don't rush out to buy a coil cover if you are a new user. Look at your coil after a few months of use. If it looks like a dog chewed on it then get a coil cover. If it looks good save yourself the trouble and some money.