Material specifications: (1) U channel 11 x 38 x 11 x 3000mm, thickness 0.5mm or 0.6mm, made of galvanized steel. (2) Gypsum board (3) Preformed wire clip Galvanized tempered wire to tight the U-channel to the furring channel. (4) Furring channel length 4000mm, thickness 0.45mm or 0.5mm, made of galvanized steel. (5) Channel bracket To hold the U-channel, made of galvanized steel. (6) Adjustable clip To adjust the ceiling level, made of tempered steel. (7) Hanging wire 4mm galvanized wire. (8) L angle 25 x 25 x 3000mm, thickness 0.5mm, made of galvanized steel.