PP ring binder, metal ring binder, ring binder Suitable for collecting the documents PP ring binder, metal ring binder, double ring binder, 3 ring binder, 4 ring binderMaterial: PPThickness: 0.35mm or upRing type: 2, 3 or 4 ring, or up to customers requestSize: A4Color: up to customers requestSuitable for collecting the documents etc.