Also very popular are perpetual calendars which come in different sizes. On these pages the standard sizes of 20 × 30 cm and 30 × 40 cm (separate page) are shown. By adding a calendar pattern a perpetual calendar is created which keeps on conveying your advertising message indefinitely. Two differently sized magnetic rings, in the color of your choice, are supplied with every perpetual calendar. Optionally a message like "Have a nice day!", can be printed on the magnetic ring.