HG Sprockets - When paired with Shimano HYPERGLIDE (HG) chains, HG cassette sprockets deliver fast, precise shifting. These specially computer-designed sprockets feature uniquely positioned ramps and tooth profiles for improved chain control during shifting. This results in instantaneous, smooth, and quiet shifting. · Aluminum sprocket carrier · Aluminum nut Number of sprockets: 10 HG gears · Sprocket: aluminum/steel Graduation: 11-34T, (11-13-15-17-19-21-23-26-30-34) · Gear finish: chrome Compatible chain: Super Narrow HG-X 3 laces on the spider