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The absoluteBLACK's HOLLOWcage® for Shimano 9100 and 8000 derailleurs makes the 9100 and 8000 drivetrains whisper quiet. It features a carbon-polymer mono-plate construction with bespoke, oversized, full ceramic bearings and one of the most advanced silencing pulleys ever made. - Designed for use with Shimano Dura-Ace 9100 / 9150 / 9170 , and Ultegra 8000 / 8050 drivetrains - Fits up to a 32t cassette - The Silent Xring Pulley dampens the chain impact on the guide pulley teeth, eliminating the engagement noise - Incredibly silent (over 12dB noise reduction vs stock) - HOLLOWcage uses full ceramic bearings (Silicon Nitride ceramic balls and Zirconia Oxide ceramic races) that make the guide pulleys incredibly stiff for greater shifting precision - Upper pulley features tall teeth to provide improved shifting precision - One of the lightest oversized cages on the market (71g) - Not compatible with Ultegra Long GS cage derailleurs

The absoluteBLACK's HOLLOWcage® for Shimano Ultegra 8150 12-speed derailleurs makes the 8150 drivetrain whisper quiet. It features a carbon-polymer mono-plate construction with bespoke, oversized, full ceramic bearings and one of the most advanced silencing pulleys ever made. - Designed for use with Shimano Ultegra 8150 drivetrains - Fits up to a 34t cassette - The Silent Xring Pulley dampens the chain impact on the guide pulley teeth, eliminating the engagement noise - Incredibly silent (over 5-7dB noise reduction vs stock) - HOLLOWcage uses full ceramic bearings (Silicon Nitride ceramic balls and Zirconia Oxide ceramic races) that make the guide pulleys incredibly stiff for greater shifting precision - One of the lightest oversized cages on the market (71g)

The absoluteBLACK integrated headset top cap is a one-piece top cap and bolt with a 5mm hex socket. It is designed to fit every standard starnut. - One-piece design is lightweight (only 4g) - Not suitable for "expanding" star nuts with a steel coil spring - Compatible with the ENVE compression plug