Features 1) Material: special grade of gypsum (whiteness>90 breaking strength:2.7M) Stair BracketsFeatures:1) Material: special grade of gypsum (whiteness: >90°, breaking strength: 2.7MPa/2 hours, no impurity), fiberglass, hollow fiber2) Finish: drying by oven. Smooth surface, clear flower pattern, obvious three-dimension effect, high strength, and excellent constructive performance. It is ...