Like other Japanese "infinite toys", this gadget simulates a mundane but strangely satisfying experience in order to relieve stress. Every time you bend it you are treated to the sound of cracking knuckles.
The gadget also features various spikes that can be used to stimulate pressure points. That's all well and good, but isn't cracking knuckles really about how good it feels (especially after you have been typing at your computer all day—hands cramping and stiffening up *crack, crack* ahh yeah...that's the stuff)? [Tokyu Hands via Tokyomango]