This is Aluminum Pressure-pointing Pushing Stick.
You can hold it in many ways.
Aluminum has good thermal conductivity, so it is warmed up to body temperature when you hold it by hand.
It takes the stiffness out of your hands and legs.
It weighs 200g, and power is transmitted to the stiffness of affected parts without it dispersed.

Aluminum
W51 D30 H130   / 2013