If you are looking for a professional and extension strap, then your research is over here. That’s because our product can meet your need. Adopted of , it is practical and durable for long time use. Clip the on the neck or back of the head to reduce ear pressure and restraint. Adjustable design, comfortable extension buckle, suitable for various masks on the market. Features -Color: Black. -Material: Nylon. -Size: About 19.00X1.00X1.00cm/7.47X0.39X0.39inch. - adjustment hook can be adapted to different tightness size to relieve ear caused by long-term wearing. -Made of , durable and practical for use. -It allows you to around your neck when it is not needed and easily pull it back in place. -You can hook the to prevent loss, no need to hold it by hand or put it in a pocket or storage box, convenient and practical. -It comes with lock hooks, to effectively prevent your from falling off. Package list: 4 x lanyards