... 4O ring is option1)cover material: 2-2.5mm rigid cardboard 2) surface: 128/157gsm gloss coating paper with Full color printing ... wood free4) Printing technique: CYMK, option: PMS color, golden/sliver foil stamping5) ring: 2D, 3D,4D, 2O,3O, 4O nickel ... plated steel ring binder 6) size: 32x26x6cm, customize size is option7) MOQ: 500pcs 3-O Ring Binder / ring binder with full color printing