... low price, 2)good oem service, 3)fast shippment, 4)with window. paper envelope size 1.material:80/100/120/128/200 ... Matt lamination,hot-stampting(silver/gold/laser/special colors)embossing /window 3.size:according to clients' individual requirement. 4.printing: ... offset printing with pantone color or cmyk process 5.oem service,different design ...