Nukeproof warhead mix match top cupnew additions for 2015 include the option to select specific top and bottom headset cups to suit your headtube and fork configuration the new cups will allow you to replace the bearings only with thenukeproof steel bearing or upgrade to a ceramic headset by simply purchasing thewarhead ceramic headset bearing precision engineered to the most exacting of tolerances to deliver optimum performance and long life in harsh riding conditions the latest 2015 gener