There's a new improved version of this product over here.

This is a hacking tool kit by GadgetSkin for replacing your iPhone 4 battery cover with something else more meaningful. There are 2 different metal finishing colors available to choose from.

::2 Metal Finishing Options::
Bright Silver Color (matches the iPhone 4 original side panel color)
Titanium Silver Color (a darker color option which resembles Titanium metal)

::Main Materials::
Outer Face Plate - Stainless Steel
Inner Frame - Plastic
Screw Parts - Stainless Steel

::What's inside::
1 X Metal Battery Cover for iPhone 4
1 X Compatible Screw Driver for iPhone 4
1 X Suction Cup Vacuum

Replace your iPhone 4 Battery Cover into something else more meaningful.
You can simply remove iPhone 4 battery cover in less than 30 seconds with this professional tool kit.
The MAGNETIZED screw driver tip will come in handy when handling small screws.
Adhere the Suction Cup Vacuum opener onto the original iPhone 4 battery cover and it will stick strong enough for you to pull out the cover easily.

PS: If you want to custom print your own design pls head to GadgetSkin's Etsy handmade custom store and request one!

::REMINDER::
IMPORTANT: Please remember to change back the original iPhone 4 Case when you visit Apple Service Center.