The hourglasses know my children from kindergarten. They are nice and big, colorful and make a pretty strong impression, since the glass is embedded in foam and encased in plastic. With us the watches are in daily use and thus help to structure the day or tasks. Immediately after unpacking (it was a birthday present) Lego was left lying etc. and 4 children were wide-eyed in front of the colorful trickling sand. I can only recommend the large hourglasses and not recommend it to buy small hourglasses that everywhere else available at mail-order companies, as they may fall slightly and break easily.
