Feature: 12 dB noise reduction over Dura Ace Precise gear shifting Aerodynamic Wattage saving Lightweight design Single-guide plate construction Suitable for: Shimano Dura Ace 9100 / 9150 / 9170, Ultegra 8000/8050, support up to 32T flywheel/Cassette. Shimano Dura Ace 9200 12spd / Ultegra 8100 12spd, Support up to 34T flywheel/Cassette. Name: The Oversized Pulley Wheel Model : Carbon Hollowcage, Ceramic bearings 12/18t wheels Colors: Multicolor, Black, Weight: 71g fit Road Bike. 12 dB noise reduction over Dura Ace. Suitable for: Shimano Dura Ace 9100 / 9150 / 9170. Ultegra 8000/8050, support up to 32T flywheel/Cassette. Shimano Dura Ace 9200 12spd / Ultegra 8100 12spd. Support up to 34T flywheel/Cassette. Name: The Oversized Pulley Wheel. Model : Carbon Hollowcage, Ceramic bearings 12/18t wheels.