Precise assembly process: high assembly precision, tight and reasonable tooth spacing, and smaller ratchet teeth yaw and sway clearance, ensuring high transmission efficiency and stable and smooth shifting. Chromium-molybdenum steel material: chromium-molybdenum steel material, made of chromium and molybdenum alloy, higher wear resistance, low temperature resistance, high magnetic properties. Extend the applicable life and achieve smooth shifting. Hollow carving technology: Each tooth has a large hollow design, which is conducive to drainage and decontamination, and at the same time, it is lightweight. Chain loss prevention design: Shimano sprocket has a special loss tooth design to prevent chain loss during riding. HG HYPERGLIDE technology: The specially designed HYPERGLIDE sprocket uses specially positioned shifting ramps and tooth profiles to better control the chain during shifting, making shifting positioning fast and reliable. Silver nickel plating: The surface of the flywheel is electroplated to prevent rust and corrosion, increase wear resistance, luster and beauty. Brand: SHIMANO Model: CS-HG4100-10/500-10 Series: ALTUS Speed: 10/30 speed Weight: 331.4g Type: Positioning flywheel Number of teeth combination: 11-28T/32T/42T Gear ratio: CS-HG4100-10:11-13-15-18-21-24-28-32-37-42T CS-HG500-10:12-13-14-15-17-19-21-23-25-28T CS-HG500-10:11-12-14-16-18-20-22-25-28-32T Compatible Chains: 10-speed Applicable models: mountain bikes, folding bikes Technology: HG