... 2) Ring shape: R(O), D, Q, A; 3) With /without booster; 4) 12 years in manufacturing; 5 ... numbers of rings. For example, 2 ring binders, 3 ring binders, 4 ring binder…etc. More than ... research, development, production, sale and service of loose-leaf binder mechanisms and accessories. We are located in Dongguan ... accessories for 12 years, and have more than 3,000 sorts of binders, meeting your all-around ...