exercise book covers 1.size :18x17,5cm/pc ,9x17.5cm/pc 2.PU material ,factory price 3.1pc/bag,50-300pcs/ctn 4.OEM welcome Black high quality exercise book covers exercise book covers 1. High quality and low price2.. with beautiful look and available at favorable price3..Customers design and size are available4.Pvc bags could be printed by offset printing,silk screen printing,hot stamping,emboss ...