This accessory set is designed to meet the needs of avid cyclists. The adjustable chin strap and head circumference adjustment knob work together to provide a secure and comfortable fit. Whether you're tackling challenging trails or enjoying a leisurely ride, this set ensures your stays in place, providing peace of mind and enhanced safety. Features -Color:Black -Material:Plastic -Size:30.00X3.50X2.00cm/11.79X1.38X0.79in -Mounting post diameter: 21 mm. -Flexible fit: the adjustable knob on the regulator allows for a proper fit, ensuring maximum comfort and security -Safety-enhancing chin strap: the chin strap is designed to stay firmly in place, reducing movement and enhancing rider safety -Multi- adaptability: provides stable wearing across various terrains, from rugged mountain paths to smooth urban roads -High compatibility: easily compatible with numerous bicycle , these accessories enhance the functionality of your -Lightweight and comfortable: made from lightweight materials, it ensures a comfortable fit, even during prolonged use, making long rides more enjoyable Package list: 3 x bike strap