... and high impact resistance . Ceiling T grids are made of galvanized steel and color steel,Ceiling T grids has many advantages, include: ... beauty, good strength, cauterization resistance, and water resistance.1) Main tee: a) ... c) 15 x 32 x 3,6000mm(12')2) Cross tee: a) 24 x 27 x 1,200mm (4') ... by customers.OEM is available light steel Ceiling grid