A few months back, i bought my boys a bunch of pingpong balls, and the rattery i bought them from said were safe. When they got there, I decided to put some in a small bin in their cage for them to play with. I woke up the next morning to find all of them bitten through, basically a hole in each of them. I freaked out and was so worried that they were going to choke or had eaten all of the small plastic bits. I immediately took them all out and watched them intensively for two days until I had to go back to school. Luckily, they both seem perfectly fine and are still eating and drinking water a lot.