We bought this tablet range for the placement of games and tasks (after the Montessori principle) for our son. We put certain materials on a tray, which is not equal to anything, anywhere flying through the area. In addition, you can make such a task / game well back into place and our son can use it when needed. Due to the different sizes you have always a suitable sized tray at hand. The trays are not painted, but still well made. So far, we have not yet painted, what we are but maybe catch up. For use as part of the Montessori method, this set is highly recommended. It is also considerably cheaper than alternatives in relevant specialist shops.