... certificate SWS (single wounded sheet), CF (centerfolded film), tube film, shrink bags Polyolefin shrink film ( Verified by SGS, FDA certificate)1. ... wrapping. 4. Airproof wrapping, dust and damp resistance.5. light but with high strength,uniform thickness6. High ... : 12 micron, 15 micron, 19 micron, 25 micron, 30 micronSingle wounded sheet, centerfolded film, tube film and shrink bags shrink wrap film