Size: A3: 11.7*16.5", A4: 8.3*11.7" How to install - you can place the board horizontally or vertically to suit your refrigerator, depending on how your door opens. List meals and menus on the refrigerator's magnetic whiteboard. Children can use markers to draw, color, doodle, and create daily, weekly, or monthly plans. Ideal for refrigerators, microwaves, whiteboards, and other magnetic surfaces. Strong magnetic backing ensures secure attachment to any magnetic surface. This whiteboard adheres to both flat and curved magnetic areas and is designed not to slip or fall. Test your refrigerator before use—some stainless steel models do not have magnetic doors. If a standard magnet sticks to your fridge, this calendar will also adhere properly.