aluminum material big aluminum double-side super light box1)technical parameterModel frame size ... 1160 X 710 28 X2 11/2202) Featurea: aluminum frame, exquisite from .portabity ,various colour may provide ... , black , red , gold)b: open from four sides easr to change pictures , install and mantainc: thickness only ... yarn depic buliding , exhibition , famliy .etc big aluminum double-sides super light box