It seems odd that this basic remake of a trick which has been performed for huge audiences the world over is sold as a toy. With sufficient practise this has everything you'd need for a very convincing segment to a performance.
I did however find that the instructions were a little hard to follow, mostly becuase the images, labelled fig1 through fig 9 were in the wrong order, so in the instructions, it directs you to completely the wrong image in some places.
The intrepid magician will still be able to perform it however, especially if they have the tenacity to look online for videos of other presentations of this effect.
Oh and ignore the people who have tagged this as stupid. All magic seems fairly stupid when you know how it's done, the point is that people watching don't see how it's done, and when done properly it is actually very clever.