Link: http://www.dansarosa.com/wholesale-thinnest-tempered-glass-film-screen-protector-for-iphone-4-4s.html

Feature:
Whole Transparency : 0.26mm thick and made with chemically treated, transparent tempered glass.
Surface hardness : 8~9H : The surface of the screen protector has a hardness of 8~9H, three times stronger than regular PET film. Even shard objects such as knives and keys will not scratch.

For iphone 5/5s: http://www.dansarosa.com/wholesale-thinnest-0-2mm-tempered-glass-film-screen-protector-for-iphone-5-5s-5c.html