Locking Slant-D shape rings with hold 25% more sheets than standard round rings. Resists cracking along the cover seam for long lasting durability. Clear overlay on front cover, back cover and spine allows insertion of custom title sheets for a professional-looking presentation. PVC-free and non-stick cover variations will not lift print or damage contents. PVC-Free Cover. Binder Type: Ring Binder Style: View Binder Size Capacity: 6" Binder Sheet Capacity: 1,300. Green : Cover board contains a minimum of 98% post-consumer content, 100% total recycled content.