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material :silk wallpaper :buyer customize size .width x height = square meters = order quantity.please tell me wide and high for your size ,we will custom your size . purchase matters: width=2.8m height=1.7m,2.8m x 1.7m = 4.76m² . you need to order quantity:5 square meter width = 3.5m height = 2.6m,3m x 2.6m=9.1 m² .you need to order quantity: 10 square meter width = 4m height = 3m, 4m x 3m=12 m² .you need to order quantity: 12 square meter