Plastic Filing Boxes Thickness:1.8-12mm GSM:260-3600 Color:white,black,green,yellow,grey,clear etc ISO, ... referred to as Twinwall plastic. Specifications of Plastic Filing Boxes : ProductCorrugated Plastic Sheets/Coroplast SheetRaw MaterialVirgin polypropylene/ ... Yard signs,graphics,road signs,display rack and point of sale displays.2.Packaging :Making boxes, totes, trays, bins, ...