Scratch Proof The precision pre-cut invisibleSHIELD applies directly to your Samsung Galaxy S III (S3), providing the toughest, most durable protection you will find. The invisibleSHIELD has its origins in the military, where it was used to protect high-speed helicopter blades from dust, dirt and debris. Now you can use that same powerful technology to protect your Samsung Galaxy S III. It is so tough that we back it with a lifetime guarantee. So, if it ever does wear or scratch, we will replace it for free, for the life of your device. And if you ever need to remove the invisibleSHIELD, no problem; it comes off clean and leaves no sticky residue.