Root volume hair rollers

I'm using it on my parting while doing my makeup, and it adds volume well without being excessive.

However, clip marks are left if I use it for even a short while, so I move it around slightly as I use it.
At first, I thought it wasn't very good because it left marks, but as I kept using it, I figured out a trick: if I hold it close to the roots, it creates volume without leaving any marks.
It is easy to use, sturdy, and good, but it is heavier than regular hair rollers, so it is a bit difficult to use on the bangs.

It doesn't have a specific brand, and it seems like a product sold at various shopping malls; I bought it on TMON.