This is a high quality ring binder made from recycled and highly durable polypropylene which is not only lightweight and tough but also kinder to the environment the binder features two 15mm o rings which stop ring misalignments and ensures that pages turn smoothly the binder also includes an internal pocket for storing loose leaf papers and a full length wrap around spine insert which makes identification and marking of folders easier made from long lasting polypropylene two 15mm o ring bin