what is the difference between http://www.bodyguardz.com/Apple_iPhone_3G_p/iphone3g.htm?Click=9481
and
(sorry i meant invisible shield not crystal film)
http://www.zagg.com/invisibleshield/apple-iphone-3g-cases-screen-protectors-covers-skins-shields.php
and
(sorry i meant invisible shield not crystal film)
http://www.zagg.com/invisibleshield/apple-iphone-3g-cases-screen-protectors-covers-skins-shields.php