Cartridges are designed to be used with the Travel Case. Disposable flossing tips include a 22-mm piece of lightly waxed, high quality dental floss. Made with 250 strands of twisted fiber, the floss has a high shred tolerance to keep it gliding smoothly between teeth. And the GumChucks quick-release button system makes it easy to toss flossing tips after each use. Adult PRO FLOSS tips work with all GumChucks handles!