Material & Size : Wooden. Size : approx 2.75"*2"?7*5cm),length*width. Including : Package include 16 pcs mini blackboard and a box chalks (4 pcs). It is convenient to you leave notes for housemates or inform party guests of your food and drinks. Use these chalkboard as a card holder for table settings at a party or a wedding. Use the clip for baskets or candy jar displays. Write a message on the board welcoming people to take some candy. The bakery or dessert shop can write on the boards warning others not to touch your food. The chalkboards are not recommended to use liquid chalk markers to write on; You had better use regular chalks to write on them.