They are hard plastic donut containers with a slime donut that you crush

I love that you can store it back in its cute container!!

The only problem is I want to spend all of my money on every set, which is a bad idea right now... even after the slime is done, you have these adorable little donut containers.

She enjoyed it immediately only to find out a week later that the "doughnut material" was no longer fun to manipulate as it had lost that fun sensory quality of slime-- even though she sealed it up in the donut containers.