It's startling at first glance. Knowing the trick is startling in a way. But it's interesting! Silk penetrates the spectator's smartphone!! Extremely visual and highly impactful. No app needed, works with any smartphone!! Borrow a smartphone from a spectator. Then, as the magician rubs a silk against the center of the screen... The silk penetrates the smartphone! The magician pulls the silk all the way through and immediately hands the silk and smartphone back to the spectator for examination, but there are no cuts or damage whatsoever. This is a very casual magic trick that is easy to perform and can be done with the spectator's own smartphone, making it an excellent choice. The product includes the silk, gimmick, and instructional DVD.