There are several types of string. For friendship bracelets, most types work as long as the colors are right and the thread is not too thin, thick or weak. With this crochet tutorial, I will show you how to make this creativity string cord made of 2 kinds of shells. You can make a string of small of large shell or you can alternate in between small and large one. I made a string of thicker yarn and as you can see here I did both shell small and large once. Crochet Strings Cord was made with Crochet hook 2 mm (#4 US standart ) and yarn: 100% cotton, 169m/50g, 4 ply. The cord is so easy that, once you get the hang of it, it works up quickly.