steel membrane - TOOGOO(R) 0.33mm 9H Premium Real Tempered Glass Film Screen Protector for Samsung Galaxy S6 EDGE PLUS The item is made to protect the LCD from damage and scratches with specially processed glass that has been reinforced to increase shock absorbency. Whole Transparency: The protector is 0.33mm thick and made with chemically treated, transparent tempered glass. Surface hardness : 9H: The surface of the protector has a hardness of 9H, three times stronger than regular PET film. Even shard objects such as knives and keys will not scratch the protector. Oleophobic Coating: The protector has an oleophobic coating that prevents fingerprints and other contaminants and makes the film easy to clean.