... are in Shenzhen;paperstockoffset/woodfree, unbleached or white kraft, art paper, other paperboardssizeinternational standard sizes: B4,B5,B6,C3,C4,C5 ... purposecolorone, two or four color/colors printingunfolded shapea rhombus, a short-arm cross, or a kitestylebanker envelope, wallet envelope, pocket envelope, window ... question please feel free to contact us. various styles of paper envelope printing