KVAGO for Sony Xperia Z2 Tempered Glass Back Protector Anti Fingerprint Bubble Free Shatterproof Shockproof Back Protective Skin Film for Sony Xperia Z2 Attach to Sony Xperia Z2's 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, warranty: replacements free of charge for Installation problem and damaged screen protectors