KVAGO for Sony Xperia Z1 Front + Back Tempered Glass Screen Protectors Anti Fingerprint Bubble Free Shatterproof Shockproof Protective Skin Film for Sony Xperia Z1 Compatible with your Sony Xperia Z1. One for front screen, one for phone back. The surface has a hardness of 9H, three times stronger than regular PET film. Even sharp objects such as knives and keys will not scratch it KVAGO Glass screen protector has an oleophobic coating that prevents fingerprints and other contaminants and makes the film easy to clean. If broken, "KVAGO" breaks into small pieces that are not sharp, making it safer than other glass products. warranty: replacements free of charge for Installation problem and damaged screen protectors