Full Speed Ahead SL-K Compact Drop Handlebar - Carbon 31.8mm 42cm BlackFull Speed Ahead SL K Compact Drop Handlebar Carbon 31. 8mm 42cm Black. FSA SL K Compact Drop Handlebars feature UD carbon construction with reinforced and textured clamping areas. Unidirectional carbon fiber finish Continuous unidirectional carbon monocoque construction 4 degree outward bend Aerodynamic integrated Cable Routing (ACR) compatible Semi integrated Cable Routing (SCR) compatible internal cable routing options for Di2 improves stiffness