The easy assembly method of the ceiling suspension system facilitates a fast and convenient way for installation / uninstallation. Its nature of fire-resistance is far more superior to the traditional interior decoration materials of wood and it is available for various kinds of ceiling panel in installation, like miner fiber board, gypsum board, PVC gypsum board and metal ceiling panelMain runner: 12 x 38 x 24 x 0. 35mmMain runner: 3. 6m x 38 x 24 x 0. 35mmCross tee: 2 feet x 28 x 24 x 0. 35mm (length: 610mm) 75 pieces per cartonCross tee: 4 feet x 28 x 24 x 0. 35mm (length: 1, 220) 50 pieces per cartonCross tee: 0. 6m x 28 x 24 x 0. 35mm (length: 600mm) 75 pieces per cartonCross tee: 1. 2m x 28 x 24 x 0. 35mm (length: 1, 200mm) 50 pieces per carton