1) 2 rings, 3 rings, 4 rings... 2) Ring shape: R(O), D, Q, A; 3) With /without ... 1) 2 rings, 3 rings, 4 rings...2) Ring shape: R(O), D, Q, A; 3) With or without ... ) 12 years in manufacturing;5) Pantented product.Loose-leaf ring metal ring binder is usually used in folder ... the research, development, production, sale and service of loose-leaf binder mechanisms and accessories. We are located in Dongguan, ...