A “Shell” is a specially-crafted magic gimmick resembling a hollowed-out coin that fits seamlessly over a regular coin. This ingenious tool allows magicians to perform illusions where coins appear, vanish, or transpose with remarkable clarity and minimal sleight of hand. The shell is designed to blend perfectly with its matching coin, making it nearly undetectable to spectators, even under close scrutiny. Shells are typically made by expanding or machining coins to create a thin, hollow shell that retains the coin’s original appearance. They come in two main types: expanded shells, which fit over standard coins of the same denomination, and unexpanded shells, which require coins to be milled down to fit inside. These gimmicks are widely used in routines such as “Coins Across” and other effects where visual precision and audience engagement are paramount. The versatility of a shell makes it an indispensable tool for both beginner and professional magicians, enabling clean and direct magical effects that captivate audiences effortlessly