This is a version of the Coin Tube in walnut instead of metal. For me, the best version is still Guldiplex by Future Magic. Tanner Tube looks good and works well, but it is hard to beat the clear tubes of Guldiplex to really take this effect to the next level.
Effect: Two polished walnut “tunnels” are shown which lock ” together making a continuous tunnel. They are now separated and a card is placed in position between them preventing any item from passing through the tunnel. Four coins (quarters) are shown and as they are dropped into tunnel, one apparently penetrates the card and drops to table. Each coin in turn penetrates the card until all have completed penetration.
(Notice: Includes: Printed Instructions.)( Post Source: martinsmagic.com - click for details )