Guided Products ReBinder Select Recycled Chipboard Binder, 4 Inch  (GDP00051)
It may be recycled, but the ReBinder Select can stand up to almost anything. The 100 pt chipboard cover is extremely thick and durable, and spine tearing will be the least of your worries. Recycled material has never been so at home in the boardroom, the classroom, or anywhere else duty calls. The D-Ring mechanism is designed to easily detach with from the cover with the turn of a couple screws so you can recycle separately. The 4" Select holds up to 690 letter-sized sheets. Designed and assembled in the USA by Guided Products.