It's a good idea to use them, because you can make different kinds of ice easily,help you to save lots of time.Besides,you can set your mind at ease to usd them because:

1.made in 100% food grade silicone.

2.100% odorless, nontoxic

 3.all colors and size available.

4. Suitable Temperature: -40 ~ 240 Celsius

5.welcome OEM and customers' design