The arms are the result of over seven years of intensive engineering are manufactured in our British Columbia, Canada manufacturing facility. The crank arms are completely hollow with all unnecessary material being removed from the centre core. The composite arms have no internal aluminum spine. Proven assembly friendly EXI spline interface ensures fast, simple installation and easy dealer serviceability using standard shop tools. Next SL features a specifically engineered, superlight, CNC machined 6AL 4V Titanium BB spindle that is permanently moulded directly into the drive side crank arm to minimize weight and maximize power transfer. All alloy T 30 Torx hardware keeps weight down and coolness high. Crank bolt puller cap makes crank removal a snap with just an 8mm hex wrench. Bearings feature our new custom triple wiper seal to better retain grease keep contaminants out. Comes with our all new Turbine BB. Bearings are factory filled with Phil Wood waterproof grease tested proven to extend bearing life.