Keep your office, desk, cubicle, or mail room organized with the Grande Central filing system. The expandable pockets feature special compartments for cards and envelopes so they are highly visible and easy to add or remove. Expand the system easily with Universal® 08136 add-on pockets, which are sold separately. Each pocket includes a writeable ID label for categorizing files or clearly marking inbound and outbound mail. Durable plastic construction.