... ad, boxes,septum Features:Material: polypropylene ppGood quality at a more favorable priceWater/grease-proof, ... with the institution of the traditional packaging materials such as corrugated paper, wood board, etc. 2) Turnover box ... as advertising board, show board, brand mark, light box board, sign board, warning signs etc. 4) ... meet clients’ needs. 2-12mm High Quality Corrugated PP Hollow Plastic Sheet