The waist training bead is made with string instead of elastic because it's less flexible and you're able to track your weight gain or loss.
It comes with a clasp which fastens around the stomach, as you can't put it on like the normal beads which are already tied.
If your beads are falling down and getting loose, this means you're losing weight. If your beads are rolling up and getting tighter, then you're putting on weight. This is the perfect accessory for weight gain/loss.