Code No.：AB1657 Product Name.：20 hourglasses in a Box - group set Classification：Time Return Login

In order for children to get a sense of time. A 10 minute break! In 2 minutes to write down the multiplication table with 7! Who can 30 seconds standing on one leg?Set of 20 hourglasses with a sturdy case. The four hourglasses: 10 minutes. (Red), 5 min. (Green), 3 min. (Yellow), 1 min. (Blue), 30 seconds. (Black).