have a lot of these in different sizes. Despite being in a paperless world there is still the need to bind papers. These binders work smoothly and I have had some for 10+ years....never broken split etc. They still work beautifully.
As a student then as a teacher and as a musician I have found this binder to be really good— It's durable the ring mechanism works flawlessly and the covers are sturdy. What more can one ask of a binder?