It's an ASHITSUBO-BOU.
Though I'm embarrased, I'll show you how to use it. The sharp point is used to
press acupressure points on the sole. I'm pressing the point of adreno.
The roud part is used to massage the sole drawing a line.
I'm drawing a line to less my tiredness.
Here in Japan ASHITSUBO-massage (reflexology) is very common. I love it.
So I often do it by myself.
The other day, two junior high school students were very tired and seemed sleepy. So I did it on them. They said "hurt, hurt" and of course they woke up!