The dimensions are: 11 inches, 13 inches, and 15 inches Amazing Value - Equip your various glasses and sunglasses with these practical retainers! Adjustable - Fully adjustable, ensuring a snug fit on the head, preventing glasses from slipping or falling off the nose. Retractable, so your glasses can also be worn around your neck! Versatile - Ideal for daily use or outdoor sports, such as fishing, cycling, skiing, hiking, rock climbing, etc. Suitable for most sunglasses, everyday glasses, and presbyopic glasses. One size fits all, making this eyewear accessory ideal for both men and women. Fashion - Competitors' straps have only one adjuster, forming an ugly and intrusive tail. These cables use dual sliders to eliminate the tail for a sleek and refined look. Buy ours and live a tailless life! Practical - Whether you're irritated by constantly pushing sliding glasses onto your nose, or want to ensure that your precious glasses won't fall or damage in the next adventure, these eyewear holders are your answer. They are made of tough and wear-resistant silicone and are durable.