After three months, I still have most of the ten-pack left. One sheet was enough to make three shields for my Kodak PlaySport (Zx3) HD Waterproof Pocket Video Camera Bundle. So far, I've used two of the three shields made from the first sheet and they last about a month a piece. Be careful to cut them to fit tightly around the view screen without much overlap. Too much overlap is what causes them to "wear out".