Dimension(mm): Red-orange:205x205 Blue:188x211 Green:211x185 Art of printing: Red-orange ,1\ cover:300gsm single-artpaper ,4C printing ,glossy lamination coated single side ,cutting a "heart" shape as a window . 2\ Inner sheet :157gsm both side art paper,4C printing ,saddle binding . Blue:1\ cover:157gsm both side art paper,4C printing ,glossy lamination coated single side , 2\ Inner sheet :80gsm double-artpaper ,1C printing ,saddle binding . Green:1\ cover:250gsm single-artpaper ,4C printing ,glossy lamination coated single side , 2\ Inner sheet :128gsm double-artpaper ,4C printing ,saddle binding .