It's a refill for a product that resembles white out in a way. It applies on like strip white out. However what you're sticking is actually tiny dots that are double sided with stickiness. So it works like double sided tape but better precision and no cutting and not much thickness.
It's an adhesive dot refill for their product. Have you ever heard of Glue Dots? This is similar to that. Basically, you can stick pictures to your walls with these but they come off later without tearing them or messing up the wall.