The wide mouth jars are the best. You cannot have enough of these lids if you plan on canning your own food. The wide mouth jars/lids are great because it is easier to stick your hand into the get something out, like a pickle.
These lids are exactly what they say they are on the box. Make sure you get the right size for the canning jar you will be using. I have no issues with this and if your canning you must use a new lid.
Never any issues with jars sealing with theses.