Adjustable ergonomic strap Kit. Only poles which have Magnetic System technology. Technologies: St magnetic strap system: - With its magical, magnetic, unique and easy to use technology, attaching the wrist strap to the pole is child’s play. Don’t worry about aiming at the pole; it’ll come straight to you. While you’re walking it is safely locked into place, so there’s no danger of it slipping from your grasp. Finally, removing it is a breeze; just press the button and let go. - The ergonomic wrist strap gives you a truly light, comfortable and accurate grip. You’ll love the comfortable, breathable fabric and the reinforced sides, giving you incredible support and pinpoint accuracy.