HYAIT Ultra-thin Tempered Glass Screen Protector for Samsung Galaxy S4 Perfect Anti-scratch: 9H greatly intensified surface hardness which is 3 times stronger than regular PET film. Even sharp objects like knives and keys will not scratch it Make your screen Perfect Shatterproof : when great impact comes and the glass protector gets broken, it cracks into small pieces that are held within the film, they are not sharp, the glass film absorbs the impact so as to protect the phone screen from shattered! 0.3mm Ultra-thin design, specially made with scratch resistant material and rounded edges for a more precise fit. Tempered glass film provides super smooth touching as well as no lose in touch screen sensitivity. Coming with a screen polishing cloth and an alcohol wipe, helps you wiping away marks and fingerprints during the easy installation, remember not to fold the tempered glass film when installing.