MyBat iPhone 4S/4 Tempered Glass Screen Protector - Retail Packaging - Clear The Tempered Glass is 0.4mm thick and made with chemically treated transparent tempered glass. Can provide break protection and shock resistance.Even sharp objects such as knives and keys will not scratch this product. The Tempered Glass has an oleophobic coating that prevents fingerprints and other contaminants and makes the film easy to clean. The Tempered Glass is coated on the back with a strong silicon adhesive that makes installation easy and the film attached firmly so as to not affect the touch screen's sensitivity.