Ball Through Hand

Performer displays a solid steel ball, a metal cup, and a plunger. The cup is placed on the back of the performer's hand, and the steel ball dropped inside. The plunger is now slowly pushed into the cup, and the steel ball apparently disintegrates. 
 
Finally the steel ball falls out from under the performer's hand, having apparently penetrated the cup and hand. We supply you with all the required apparatus along with full instructions.