The Bicycle Hinge Clamp Spring Automatic Rebound Device is a durable and reliable accessory designed specifically for Brompton folding bikes. Made from a combination of plastic and alloy materials, this spring ensures smooth and secure folding and unfolding of your bike. The automatic rebound feature adds convenience and ease to the folding process, making it a practical choice for regular users of Brompton bikes. Trust in this high-quality part to enhance your biking experience and make your daily rides more efficient.