A large metal cuff is put around a spectators arm. A silver sword, is then pushed through the cuff, and apparently right through the spectators arm!
The effect is really dramatic, but naturally at the end, when the sword is taken away and the cuff opened, the spectator is completely unharmed!
The effect can be presented by the performer also on his own arm.
The sword is 47 cm long. The cuff is 19 cm long and has a diameter of 8.5 cm.