Speck SeeThru Hard Shell for 20-Inch iMac - Black-IM20-BLK-SEE Hard shell, bright color plastic cover for iMac 20 inch Add some color to your Mac! Totally removable, easy and safe to use. Place SeeThru case over the front of your 20-inch widescreen iMac computer. 4 rubbery "compression bumpers" inside the case (2 on the top, one on each side) will help to hold it nicely in place. Personalize your Mac - make it look even cooler This case is made to fit on the 20-inch widescreen model Apple iMac (aluminum model only). It will not fit on older iMac computers.