[M] Cygnett Metalicus Silver Aluminium Case for iPhone 4 & 4S Review
 

The Metalicus is one of the cases from Cygnett which sport a killer look, is quite affordable and comes in three different color variants. The case is, however, attenuating the GSM signal and occasionally we have also seen WiFi signal drops.

http://www.madshrimps.be/articles/article/1000399/