Penetration Frame - This latest type frame is made of plastic, so it is possible to eliminate the hazard of glass breakage. A piece of clear plastic glass mounted in a frame can be critically examined both before and after the trick. Cards are fastened to each side by means of clips which are a part of the frame, and the wizard then thrusts a pencil and other object through the center of the cards and glass. The cards are removed, and examination of the glass fails to disclose any hole. Extremely ingenious.