Cardboard Connection book
The centers of any two cards are openly torn out creating a pair of impromptu "rings." These cardboard rings, which can be signed, are instantly linked together! The two cards are actually seen to be connected through one another. The linked cards are then magically disconnected and are both immediately handed out for examination. A new principle in penetrations enables you to perform this close-up linking ring routine under test conditions without resorting to special gimmicks, gaffs, switches or key rings. Completely impromptu - can be done with any deck 32 pages with 31 illustrations"
A-1 MagicalMedia (V)