They do exactly what it says on the box. They went on easy enough and they provide my screen with protection. You have to be quite adept at applying these or they will bubble. If you have little to no patience get someone else to place them on your Kindle for you. I like this pack because if you need more than one attempt you have spares. But don't think it's the product that is at fault if they bubble...sadly is probably human error. As I say, get someone else with patience to apply it for you and you'll be disappointed!