Review on Buy Koplow Games School Specialty Plastic Sand Timer Set- Set of 3, 4 inch Timers by Jennifer Miller

Mouse for homeschooling, 3 year old loves just watching the falling sand, older kids use it for timely cleaning, quick cleaning or other small jobs (preparation before the sand disappears) , brushing teeth, etc.). Editing from 5 stars to 3 stars because the kids managed to open all the vertices and now they are useless! Not the company's fault but just thought I'd share it. Was looking for something more childproof/waterproof. Also, they got wet and the sand got wet and sticky and now they don't work either + the caps on both ends come off very easily, which can cause the baby to choke.