... rings 2) Ring shape: R(O), D, Q, A; 3) With /without booster; 4) 12 years in manufacturing; 5) OEM ... rings...2) Ring shape: R(O), D, Q, A; 3) With or without booster;4) 12 years in manufacturing;5 ... to numbers of rings. For example, 2 ring binders, 3 ring binders, 4 ring binder…etc. More than 10 ... and accessories for 12 years, and have more than 3,000 sorts of binders, meeting your all-around requirement ...