Marble by John Kennedy - TrickJohn Kennedy has created a brand new gimmick that enables you to make an ordinary glass marble roll as if by magic! No threads, magnets, or electronics are used. This precision gimmick is durable and built to last. And it's so compact that you can store it inside your card box along with the deck! Just perform your favorite card tricks and bring the gimmick into play when you need it. Marble can be performed seated or standing, and no special clothing