This 3×3 speedcube in a miniature format is part of the Cubing Classroom-series from Moyu.
Cubing Classroom – 3×3 Keychain
This is a small 3×3 speedcube that can be attached to a key-chain, backpack or something similar. There’s a robust chain at the cube’s corner that can easily be attached to an object of your choice. The chain can also be easily removed from the cube if you just want a small cube. The cube itself is of good quality and the layers are all easy to turn. Instead of having stickers that can be worn out, the plastic itself has been colored.