1. Materials: 100% natural gypsum 2. Thickness: 7mm---9.5mm 3. Sizes: 595x595mm, 600x600mm, 605x605mm as you want 4. Size tolerance: length<±0.5mm, width<±0.5mm, thickness<±0.5mm 5. Weight: 7.5mm=6.7kg/m2, 8.0mm=7.0kg/m2, 8.5mm=7.3kg/m2, 9.0mm=7.5kg/m2, 9.5mm=7.8kg/m2 6. Characters: fire-proof, moisture-proof, heat insulation, sound-absorbing, smoke-proof, mould-proof, used repeatedly, without pollution, installation easily, light in weight, non-flammable 7. Edge: tapered or square edge.