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It is part hard plastic, part rubber. It looks nice on the phone.
 
As the name implies, it's a bumper, not a case. It simply covers the perimeter (edge) of the phone, leaving the front and back exposed.
 
No the apple ones are a rip off. Come one 30 $ for a peace of plastic? http://www.dealextreme.com/p/stylish-protective-bumper-frame-case-for-iphone-4-orange-47525 these are 2$....

I've had both the Apple version and the cheapos from Deal Extreme.

Theres is a huge difference in quality and materials between the two. The Apple version has metal buttons and fits nicely. The Deal Extreme are garbage cheap feeling no metal buttons and the colors are very odd.

You get what you pay for
 
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