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The absoluteBLACK's HOLLOWcage® for Shimano Dura-Ace 9250 12-speed derailleurs makes the 9250 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 Dura-Ace 9250 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'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)