This is probably the pen light that everyone uses at Eir Aoi's concerts. The light is very bright! Gonna use this when she comes to my city for another concert.

Gonna wear this when Aoi comes back to my city. The sizes are kind of smaller than usual. So if you're big, you should choose a bigger size.

It feels great and fits well. The only drawback is that when I insert the wristband through my hand, the wristband shifts down along with "Eir Aoi World of Blue" logo so that it is not in the center anymore.

The bracelet is about 8 inches (~20.5 cm), and it fits me perfectly. It also looks very good too!