There are 2 ways to make invisible string that I know of at least. #1 is what i think is best but not if you don't have a conferter to waste.You'll notice on the conferter that there might be a bunch of creased in disines what you need to do is try pulling on that strings making that crease. Pull out as much as you want. this string works best with a gray shirt it might not though with different tipes of strings. but its better becuase of how heavy of an object it holds.#2 is made of nilon. Just get some and take one string out of that bigger one then once you have one string. This is better for things like rolled up paper or a card. Now how you can use it I dont know how to make migicians wax but you can use just ordinary see through tape. Like durring a magic trick tell that person over and over again to remember that card while carefully putting on the the tape and string.Now have fun p.s.nilon is very fragileso be carful not to break it while putting it on.