These sturdy A4 ring binders are made from durable paper-over-board and are available in several colours (Black/Blue/Green/Red). With a 40mm spine width ideal for neat, colour co-ordinated filing, they also include a label on the spine and an internal index allowing for easy identification of contents. The standard 2 O-ring mechanism has a 25mm capacity which can store approximately 200 sheets of 80gsm punched A4 documents.