Brake pads specifically formulated and optimized for best performance with ENVE carbon rim brake rims and wheelsets. For road, cyclocross, and gravel riders using ENVE rims and wheelsets. Grey Pads - Replacement brake pads for full-carbon ENVE rims and wheelsets with a smooth surface brake track. Black Pads - Only for use with updated brake track found on ENVE SES 2.2, SES 7.8 and most recent versions of SES 3.4, and SES 4.5 wheels.