Adapted to the documents that need an optimal protection. Completely powdered, waterproof and strong. They assure a reception in perfect state. Economical: ultra light and compact design, in order to reduce your charges for postage. Satinized aspect, in order to guarantee an excellent quality. Plastic 100% polyethylene high density, Tyvek quality, 55 g/m². Recyclable. Size C4: 229 x 324 mm. Without window. Closing system with self-seal tab with protective strip, for a perfect adherence. Package of 20 envelopes. Color white.