Modern Flap Card (Face to Blue Back) by Hondo Teleportation and then they try to

and then they try to keep up with the magician as he "teaches" them how to unlink and then to link them again

and spectators can clearly see the bulb and straight through the bag

This book has it all - everything you would ever want to know about the Linking Rings

to card to

It's all answered here

Modern Flap Card (Face to Blue Back) by Hondo Teleportation and then they try toThe Flap Card was first introduced in 1922, in Professor R. Kunard's Book of Card Tricks. In the decades since, it has become a staple in the routines of magicians worldwide, used to produce all sorts of stunning effects. However, limitations of the original 1922 design constrain these performances: magicians must precisely position their audience, keep constant pressure on the card surface, and perform tricks almost immediately after setup for best