... advantageshave 14 years of professional experience in printing and exporting;have Heidelberg printing machines and envelope making machines;great supply capacity and punctual ... , art paper, other paperboardssizeinternational standard sizes: B4,B5,B6,C3,C4,C5,C6,DL;North America sizes: A1,A2,A6,A7 ... question please feel free to contact us. various styles of envelope printing