... 10 years experience High quality Small MOQ Ring Binder-Customized Paper Ring Binder/ File Folder/ O-Ring Binder/ D-Ring Binder 1. Eco-friendly, weather and tear resistant ... ",2.5",3",3.5"6. Ring Spec: 2 rings, 3 rings, 4 rings, O-ring or D-ring are available. Who Are We ... ? Mr. Memo Printing Co., Ltd, with the experience of ring binder and folder production for more than one decade, primarily serve ...