There are plenty of sharpie effects on the market. And I’m sure some of them are great. But Double Cross is by far the best effect you could carry with you. I’ve owned this product for some time now, and let me tell you the reactions you’ll get are priceless. The trick is basically over once you do the sneaky move, and then you can perform it how you want. There will be practice involved. But to be honest just get your patter down. And you’ll be fine. I’ve done this many times and every time it gets the best reactions ever.