On the Circular Disc for Year Calendar the Annual Ring (Art. No 03000) can be placed centrally. For each day a marble will be placed on the ring, starting at the current month. At the end of the month you clear the ring and space is made for the new month. 1 wooden disc with 35 coloured wooden marbles. Materials: lime and maple wood, non-toxic water based color stain, non-toxic plant based oil finish. Size: diameter 50cm.