You can measure your childs height precisely. The ruler and animal marking board are both magnetic, so you can move them freely to measure your childs height. The magnets in the marking board are well secured. The set includes a marker for marking height on the ruler. The product is easy to install and uninstall. To install, simply peel off the plastic film on the back of the chart, you can stick it adhesive side down to any flat surface. The package includes: a dinasour or unicorn or giraffe marking board, a growth chart, a tape measure, and a marker with eraser. Marking board is made of EVA, which is eco-friendly, non- toxic, safe and soft. You can easily erase and mark again on the chart. Growth chart size length 70 inches (180cm), width 1. 8 inch (4. 8mm) .Products from Botao's store