... D-shaped OEM/ODM:Accepted a5 ring binder with leather Breakthrough traditional style, high quality and fancy printing on ... SizeA4 /FC or customers' requirementsMaterialEco-friendly PP, PVC, leather PUColor/logo SelectionCustomedRing shapeO-shaped, D-shapedPrintingCustomer's design or ... pattern is various advantages.PU leather with surface should be more than the natural leather. In the human daily life ...