"Zalman GS1000 is a hybrid aluminum/steel full-tower case from Zalman: its side panels and details from its front panel are manufactured in aluminum, while its internal body is manufactured using the traditional zinc-coated steel. This helps reducing the price of the case compared to all-aluminum units. This case has four 5 ¼" bays and six 3 ½" bays for hard disk drives on the front of the case, three of them with hot swapping capability, and several other features."