Willing int'l has already exported different kinds of panel, such as polystyrene sandwich panel, rock wool sandwich panel. Features Polystyrene Sandwich Panel:1) Structure: a) Upper and lower layer: uses many kinds of metal sheets or decorative polywood sheets b) Middle: condensed polystyrene foam board2) Width: 1,000mm, 1,180mm3) Thickness: 40mm, 50mm, 60mm, 75mm, 80mm, 100mm, 125mm, 150mm, ...