Supershieldz for Nokia Lumia 521 Tempered Glass Screen Protector, Anti-Scratch, Anti-Fingerprint, Bubble Free, Lifetime Replacement Warranty Made from the Highest Quality Tempered-Glass with 100% Bubble-Free Adhesives for easy installation and no residue when removed 9H Strong Hardness Anti Scratch: three times stronger than a regular screen protector film. 99.99% HD Clarity and Maintains the Original Touch Experience Protect Your Screen from Scratches and Drops Pre-cut to fit your screen exactly .