The brain teaser puzzle is made of high quality ABS material, which is very sturdy and not easy to fall, even if the brain puzzle blocks fall off the table, there will be no problem. The side length of the maze puzzle game is 3.35 inches, so the puzzle cubes can easily fit into any backpack or luggage. Puzzle Cube allows you to spend a lot of time in cars, trains and planes, making long waits before your destination more interesting. Please note: When the beads come out from the end point, please be prepared in advance and grab them with your hands.