Anti-Tightening:The Strap Extender can help to keep your strap tighted when you work and doing exercise and prevent any harm and pressure to your ears from the cords. Adjustable Length: The Strap includes 3 adaptable card position, which can effectively help adjust your strap to fit different face size. can also be useful for kids when keep your band at the smallest card position. Ear Scratch Alleviating: Compatible with most of the ear-mounted straps on the market. You can change the buckle in seconds and reduce the pressure and ear fatigue on the ears. The Strap Extender is good for current office workers when you work for a long time or doing exercise, bicycling, help protect your ears. The Package include 3 psc hooks.The brand name is Azauvc, sold by Azauvc.Welcome to contact us by visiting our store, if you have any question just contact us via service email, we offer 7days/24hrs Customer Service.