It's a massage roller.

It is a massage roller that I have been using for quite a long time.

As far as I remember, it's a Daiso product from about 10 years ago.

The handle length is just right, and since it has rollers all over, you can massage it anywhere, from your neck and arms to your calves.

In particular, it is quite effective for making your arms bulge out, just like your calves get sore.

It has a slightly curved shape, so it rubs almost everything except the face.