1. This bicycle fork spacer, also known as the headset spacer, is made of aluminum alloy and is sturdy and durable. 2. It comes in a variety of specifications, including spacers of different thicknesses, such as 2mm, 3mm, 5mm, 10mm, 15mm, and 20mm, which can meet different installation needs. Whether it is to fine - tune the height of the bicycle fork or make personalized adjustments, these spacers of different specifications can be useful and create a more suitable riding experience for cyclists. 3. It has relatively strong adaptability and can be compatible with a variety of bicycle models. It can fit well with both daily commuting bicycles and professional cycling vehicles. 4. It is a practical accessory for improving the performance and comfort of the bicycle, bringing more convenience and comfort to your ride.