Features: Durable Material: The bicycle headset sp is made of high-quality nylon plastic material with a smooth surface and fine craftsmanship. Different Sizes: The inner diameter of the sp is 28.6mm. The package includes 6 front stem sps, providing ample quantity and consistent sizing. Appearance and Performance: Precision-cut bike headset sp with smooth edges, suitable for most road and racing bicycles, offering a refined texture and long-lasting durability. Lightweight and Compact: The bicycle stem sp is lightweight and easy to install or remove, helping save time during assembly or adjustments. Wide Application: High-precision cut sps designed for bicycle headsets, compatible with most road and mountain bikes. Specifications: Material: Plastic + Nylon Color: Black Package Weight: approx. 62g Size: As shown in picture, two sizes: 28.6mm / 31.8mm Note: Please allow 1-3mm error due to manual measurement. The actual color may vary slightly due to monitor display differences. Package Includes: 6 x Bike Sps