The Winc Earth™ Durable Insert Binders are 100% recyclable and 70% biodegradable featuring 70% recycled content and no volatile organic compounds. Made with a heavy-duty board for added strength and durability. The polypropylene cover is glued to the board instead of welded, this removes all air between the polypropylene and the board and thus eliminates the chance of crinkling. Each binder features a clear pocket on the front and spine to allow the easy insert of a cover sheet and spine label. A business card slot is also included on the inside front cover. Finding the Right Binder Size: The size of the binder is measured based on the size of the ring, not the width of the binder’s spine. Simply measure the diameter of the rings from the inside top of the ring to the inside bottom for the right binder to suit your needs.