Straight from the Campagnolo Tech Lab these shifters have been designed for maximum performance Feature 'Back to Zero Position' to optimize aerodynamics and ergonomics The levers have an adjustable starting position to fit all type of bars and the best personal hand position 'Double Shape' levers have optimal ergonomics that reduce shifting effort Multiple shifting rear shifter allows for up to 3 shifts up or down at a time. Micro indexed front shifter allows for an optimal front derailleur position 11 speed models are available with either carbon or aluminum levers. 10 speed is aluminum only