The 21.5" iMac All-in-One Desktop Computer is an all-in-one desktop computer with an ultra-slim unibody design. Measuring at just 5 mm at its edges, the iMac has 40% less volume than the 2011 iMac. The body of the iMac isn't the only thing that got thinner. The LCD display is now 5 mm thinner, and Apple also removed a 2 mm gap between the LCD panel and the glass to save even more space.
This model has a 21.5" 1920x1080 LED-backlit 16:9 widescreen IPS display with the "cover glass fully laminated to the LCD and anti-reflective coating." The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges.