This desk pad calendar insert is 28.75" x 16.75". It is designed to fit in the following Dacasso side-rail desk pads: P1403, P3603, P5003, P5203 and P5403. The calendar insert has an individual sheet for each month with all the major holidays labelled. A note section is included on each sheet as well. Extra space is provided on both sides to allow the insert to be tucked beneath the side rails securely.