Donn brand SDX/SDXL416 4 feet suspension system cross tees have a flat, white, durable finish and are made of hot-dipped galvanized steel. They have a patented quick-release cross-tee clip for convenience of installation. Made of galvanized steelIntermediate dutyOffset edge detail4 feet height1 inch widthWhite color0.625 inch thicknessPlug-in positive lockCross tee type