Profile Design Aerobar Bracket Riser Kit - 40mmRisers easily add height to Profile Design aerobars to dial in your fit. Achieve Optimal Positioning: Achieve optimal positioning with the Aerobar Bracket Riser Kit. Easily adds height and quickly adapts Sonic Ergo (35a, 45 25a and 50a), Supersonic Ergo (35a, 45 25a and 50a), Subsonic Bracket, J3 Bracket and J2 Bracket, T+ Carbon Series, T+ Aluminum Series Aerobars to fit a wide range of riding styles. Compatibility: Sonic Ergo (35a, 45 25a and 50a),