Root volume clip hair rollers

This is a product that frequently appears when you search for root volume clips or root volume hair rollers. It isn't a specific brand, but it is sold at various online stores, and I purchased mine from TMON.

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.
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 where if I hold it close to the roots, it creates volume without leaving marks, so now I'm using it well.