JETech® 3-pack screen protector for iPhone 4 / 4S Screen Protect stress-free, bubble-free installation, anti-fingerprint (HD Clear) (Wireless Phone Accessory)
High-quality film at a very good price-performance ratio! Very well adapted to the iPhone, the application succeeds very well, but is heavily dependent on the skill of the user. But I do not know what you could improve on the film yet, to center them