It is not 10x12 more like 8x10 when set up....maybe the overhang of the roof makes it 10x12 but the useable area is 8x10. It is made of an aluminum so not what you think when you read ‘steel’. It is solid and will last a long time. I am happy with it, but the description is a bit deceptive. The netting and curtain material is very heavy duty and I am extremely happy with the quality of materials.