Inventive Metals has announced a line of iPhone cases constructed from solid aluminum. The cases are available in six different powder-coated finishes and are designed to protect the iPhone 4 and iPhone 3G/GS models.

While inside the case, the iPhone is completely functional with access provided to the screen, all buttons, speaker, microphone, and headphone jack. Most importantly, the cases don’t interfere with cell phone reception, says Inventive Metals’ product manager, Ron Benditt.

Inventive Metal’s iPhone cases are available for purchase online at http://www.inventivemetals.com and cost US$69 each.