For Sale: Cooler Master MasterBox MB511 – ATX PC Case with Front Mesh Panel (Racing) Selling a Cooler Master MasterBox MB511 ATX case with front mesh panel in Racing design. Condition: Used for about 1 year, in good condition. Some minor scratches (see pictures), so it is not brand new. Comes with 3 pre-installed fans, all fully functional. Additional Info: This is not an expensive, high-end case – it’s quite lightweight. Great if you don’t mind skipping fancy glass panels and RGB lights. A practical, airflow-focused case—perfect for a budget-friendly or functional PC build!
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