External size: 7.5 x 7.5x 5 cm; Inner size: 5 x 5 x 1.3 cm
You can hide a ring, a clue of gift or other gift in it to give somebody a surprise
When opening the box, the red side face up, and the table top is struck with a force of about 1 kg to separate the steel ball from the magnet and then separated degrees along the horizontal plane.