Fractal Design - Add a layer of refinement to your Define S/R4 or Core 3300/3500 Series case with an upgrade to tempered glass. https://www.fractal-design.com/products/accessories/define-s-r4-tempered- glass-side-panel/black/ | Facebook
NeweggBusiness - Fractal Design Tempered Glass Panel Upgrade for Define S, R4 Series and Compatible Cases - TG with Black Frame
Price history for Fractal Design Define 7 Black Dark TG - Pangoly
Fractal Design Now Has Tempered Glass Upgrade Kit For Define R5 And Define S Cases - Modders Inc