Ring Binders are most Ideal for filling large quantity for punched document that are frequently referenced. Used majorly for project report, office papers, proposals with and without separators. Saya Ring Binders and made of high Quality PP/ Cardboards for Extra strength. Specially made Heavy duty steel ring with plastic stopper holds makes sure that the sheets are secured properly inside the file. Saya Ring Binders are available in both A4 and Foolscap sizes..