The SuperBlue Hard Shell Box combines the features of the hard shell thermoset box and the thermoplastic PVC style box to create a new rigid nonmetallic wiring box Molded out of specially formulated thermoplastic material, this box is so strong it wont crack or break, even in extreme environments So rigid, it resists flexing and holds its shape even under the worst conditions Wont crack or break in extreme environments Non-corrosive and non-conductive Blue 14 cubic inch