... 3 rings, 4 rings, O-ring or D-ring are available. Mr. Memo Printing Co., Ltd. with the experience of ring binder and ... than one decade, primarily serve the major research institutions in China, and more than 90% of international large pharmaceutical companies who ... develop business in China, such as: Pfizer, Roche, Novo Nordisk, GSK, Bayer, Merck ...