Expanded Half Shell by Kueppers. High Quality Precesion Craftmanship from Roy Kuepper Coin Workers Dream! The Expanded Coin Shell is one of the most deceptive effects in magic! You can eliminate difficult sleight of hand immediately, by adding the Shell in your coin routine. Only the edge of the coin is stretched, no distortion of the face of the coin. Perform Coin Miracles with this Precision Gimmick: Vanishes! Penetrations! Transpositions!