The small bracelet has an inside circumference of about 5.5 inches (13.5 cm), unstretched. I don't want to see how far it stretches since I don't want to break it, but my wrist is about 5.75 inches, and it fits me well enough. Although the elastic broke on mine (cause I was twisting it too much, not cause it was too tight), and it was a lot more comfortable when I replaced it with less strong elastic, but I'm really sensitive to having bracelets be too tight. I don't know the circumference of the normal one, but in the picture it has like five more beads than the small one. But I ordered a normal size one a little while ago, cause I want like one more bead than is in the small ones, and it occurred to me that I can just take out a few beads to make it the size I want.
So yeah, if you're not sure, go for the bigger one and get yourself some jewelry elastic if it's too big
