An Excellent trick for every one.
Cubio is Easy to use and will baffle you family and friends for hours.
When the Magician is holding string, the Brass cube will slide up and down and on the spectators command it will stop and start anywhere on the the sting.
When you hand the trick to the spectator the brass cube just slide up and down no matter how much they pull and stretch the sting.
Very visual and easy to do magic.
Machined of Solid Brass. Examinable!