The OEM Sure Hook Hanging Pocket is a letter-size folder designed with SureHook Technology, featuring built-in tension springs that ensure folders stay on track and slide with ease. It has full-height, 3-1/2" expandable gussets to prevent the folder from getting caught on folder rails. Made with polylaminate reinforced folder tops, this product contains 10% post-consumer fiber and is acid-free. The standard green color comes in a pack of 4.