paper binder printing 1.Item:Folder / Binder 2.Ring:O-Ring, D-Ring with booster or not. 3.Professional Service paper binder printing ... 1). Materials: 128GSM or 157GSM glossy art paper, chipboard, etc 2 ... rings, D rings, O rings or oval rings, 1.5", 2", 3", etc as interior diameter of rings 3). Finish for ...