Risers easily add height to Profile Design aerobars to dial in your fit. FEATURES: Achieve Optimal Positioning : Achieve optimal positioning with the Aerobar Bracket Riser Kit. Easily adds height and quickly adapts Sonic Ergo , Supersonic Ergo , Subsonic Bracket, J4 Bracket, J3 Bracket and J2 Bracket, T+ Carbon Series, T+ Aluminum Series Aerobars to fit a wide range of riding styles. Raises armrest and extensions together to maintain a comfortable wrist position Kit includes 2 risers and 4 bolts specific to the kit size SPECS: Compatibility: Sonic Ergo, Supersonic Ergo, Subsonic Bracket, Neosonic Bracket, J4 Bracket, J3 Bracket and J2 Bracket, T+ Carbon Series, T+ Aluminum Series Aerobars Includes: 2 risers and 4 bolts specific to the kit size Maximum Height: 50mm Clamp Diameter: 31.8mm (not compatible with shim kits) Weight: 10mm - 14g, 5mm - 7g