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Corsair Obsidian Series 750D Airflow Series Review - It's big. It's black. In fact it's "Obsidian!" Corsair's new 750D computer case is actually all steel and brushed aluminum, not volcanic rock. Corsair's take on the 750D Airflow Series is that it is easy to build in and has all the features you need rather than a plethora of bells and whistles that only look good on a spec sheet.