The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges. JUST THE IMAC SUPPLIED NO KEYBOARD OR MOUSE. EXCELLENT SPEC MACHINE. Connectivity includes four USB 3.0 ports, dual Thunderbolt 3 (USB-C) ports, Gigabit Ethernet, 802.11ac Wi-Fi, and Bluetooth 4.2.
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