Sturdy Material: The bicycle expansion hanging core is made of premium aluminum alloy, which enjoys high toughness and durability. Scientific Design: The bike Headset is designed with more spines, which make the bite stronger and harder, not easy to loosen. Easy to Use: Bike expansion core enjoys good processing technology and high cost effective. It is convenient to install and remove. Universal: The expansion range is about 2.1-2.6cm, which is universally compatible with most of the front fork. Replacement Part: The bicycle hanging core is a perfect replacement accessory for road mountain bikes. Color: Black/Red/Gold/Blue Material: Aluminum Alloy Size: Approx. 10x8x5cm/3.94x3.15x1.97inch Expansion range: Approx. 2.1-2.6cm/0.83-1.02inch There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. 1 Pair Bicycle expansion hanging core