... Ring shape: R(O), D, Q, A; 3) With /without booster; 4) 12 years in manufacturing; 5) OEM ... shape: R(O), D, Q, A; 3) With or without booster;4) 12 years in manufacturing;5) ... research, development, production, sale and service of loose-leaf binder mechanisms and accessories. We are located in Dongguan ... experienced staff members are always available to coordinate with you, and to help your products to be ...