Quả cầu đảo ngược (Inverted Sphere)

You can figit in many ways with this sphere please enjoy!!!

Tips:

At the begining of use combinding it might feel very tight but the more you use it the less tight it will get.

When combinded it way take a little bit of effort to seporate the 2 halves but if you put 2 different fingers on the 2 different halves and push your fingers inward it will easily seperate the 2 halves.