How do they do it?

Today, in the post, I received this package from China containing all these capacitive "pens" for tablets. 

The price? £1.10 total including airmail delivery!! This price is unbelievable and they make a profit!

UPDATE 1326z: I have tried these on a couple of tablets and they work well. I have yet to try these with my Inrico network radio. This has a small touch screen, so they should prove very useful.