This pack of 100 ruled index cards makes studying or organizing information a breeze. The pack includes 25 each of blue, pink, canary and green cards. The 3" x 5" size is easy to hold for younger children, easy to transport for studying on the go, and still holds plenty of information. The cards are ruled on one side and purposely left blank on the reverse to allow space for charts, diagrams or other unstructured content.