NUOLUX Eyewear Cord Neck String Spectacle Frame Holder 12pcs(Random Color) 12pcs will be sent in random color. Material: Nylon. Cable Length: 24 inches 61 cm. Cord thickness: 0.12 inches 0.3 cm. Suitable for myopia, reading glasses, sunglasses. Can be used for outdoor sports, play ball, or out of travel. With adjustable design which fits different head sizes.