Eyeglass Straps: The glasses retainer helps you to securely fix the glasses on your nose without having to push them back into place frequently, and they can be hung on your neck when not in use. Adjustable: The glasses cord is designed with adjustable ends to adjust the length and fit your head perfectly. The adjustable anti-silp loop fits most glasses and more secures your glasses. Hand Wash Fastening: Adjustable YJGS01_BK_6-XYKJ High-quality Materials: The lanyard is made of suedette, which is not easy to break, does not harm the skin and can be used for a long time. The simple design is suitable for all kinds of glasses. Widely Used: Very suitable for daily life, work and outdoor sports to prevent your glasses from losing. Suitable for most glasses frames, such as sunglasses, reading glasses, children's glasses. Suitable Size: The length of each lanyard folded in half is 35.5 cm / 13.97 inches, which is long enough to fit your glasses, including 6 black lanyards, enough to meet your different wearing needs.