On sale! (normally $29) The Fractal Design black side panel for the Define R5 series features a large fully transparent window allowing you to display your setup in style. The acrylic window side panel features the same clean, Scandinavian design as the case itself, and has a completely flat outer surface without any plastic bezel or rivets. Installing the Fractal Design side panel could not be easier - simply remove and replace the standard panel for an instant custom looking upgrade.