... , damp-proof, lower price 1) Introduction of PP corrugated sheet boxes PP ( Polypropylene) hollow sheet can be called corrugated sheet, this ... 's very Eco-friendly, no pollution for people. PP plastic boxes are made from PP sheet, the sheet can easily be ... and cutted, then make all kinds of transportation boxes, mailboxes, gift boxes, food packing boxes as customer's design. 2 ) Product features and ...