A. This is a fork spacer suitable for mountain bikes and fixed-gear road bikes. It is designed to meet the needs of cycling enthusiasts. Made of aluminum alloy, it is sturdy and durable, effectively enhancing the performance and stability of the bike. B. This spacer comes in a variety of specifications. There are different thicknesses to choose from, including 10mm, 5mm, 3mm, and 2mm. It also comes with a set (3 pieces of 10mm + 1 piece of 5mm + 1 piece of 3mm + 1 piece of 2mm), allowing you to make flexible adjustments according to your actual needs. It can be adapted to different bike head tube bearings, providing a suitable solution for your beloved bike. C. Whether you are a professional cyclist or an everyday cycling enthusiast, this fork spacer can significantly improve your cycling experience. Its reliable quality and diverse specification combinations can meet various cycling scenarios and personalized adjustment needs, keeping your bike in good condition.