When it comes to handlebars tried and true aluminum remains the material of choice for many pros in part that is because their bikes have to meet a minimum weight requirement but that means aluminum bars such as the service course sl have to meet the fit durability and performance standards of teams such as team exergy twenty12 and cannondale the service course sl is produced using zipps proprietary ztl 71 alloy and intricate internal butting processes to achieve a weight of 285 g 44 cm