ring binder به انگلیسی
From Longman Dictionary
ring ˌbinder noun [countable]
a file for holding papers, in which metal rings go through the edges of the pages, holding them in place
Example
It is presented in an A4 ring binder and each section is well indexed
At other levels materials will fit into a larger format ring binder, possibly Deskfax
At the Survival level, packs of loose-leaf materials will be available to fit into a Filofax/Organiser ring binder