Innovative lid has a special compartment to hold cards in a propped-up position. Features an extra durable plastic construction. Each box holds 300 3"" x 5"" cards. Sold as a pack of 6 index card boxes.- Lid features special slot to prop up cards.- Capacity to store 300 3"" x 5"" cards.- Durable plastic.- Pack of 6 black boxes.- Sold as 6 pieces/Bundle..