Features: Secure eyewear effortlessly with adjustable glasses straps, soft silicone and steel wire construction for lightweight durability during active use. Sweat resistant design with silicone and steel wire ensures easy maintenance and universal compatibility with most sunglasses, glasses, and eyeglasses frame. Ideal for men, women, and kids needing eyewear security during sports, outdoor, or daily routines. Perfect companion for fishing, hiking, cycling, water sports, and gym, keep eyewear accessible without neck irritation. Five pack black straps offer eyewear retention with reinforced steel cores, combining functionality with comfort across multiple activities. Specifications: Component: Silicone+Steel Size A: Approx. 23-34.8cm/9.06-13.70inch Size B: Approx. 18-25cm/7.09-9.84inch Type: 8 Option Quantity: 5Pcs Package Includes: 5Pcs Glasses Retainer Chain note: 1.Please allow 1-2cm errors due to manual measurement, note that you donot mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.