Automatic Roller shutters CE,TUV,RoHS,CB MAX SIZE 22sq.m(window) ... period 15yrs Power coating surface treaded The Largest Professional Roller shutter Factory ! Shinilion Automatic Roller shutters Introduction Material is Using 97% purity aluminum ... proof , noise-proof , warm-keeping .Save energy design,when the roller shutter closed, can saving 30% energy, obstructed 100% sunshine. ProductionStandard ...