Front Brake Disc for Yamaha XT660X 2004-2016Fit for Yamaha XT 660 X 2004 2016. This brake disc rotors are constructed from 420 stainless steel & anodized 6061 T6 aluminum. Wave shape brake disc for weight saving and increased clean effect. The slotted rotor ensures water and dirt are dispersed quickly when braking. The grooves on the disc surface create a self ventilating system to make brake system cool down and also prevent mud and dirt from interfering with braking performance. 20% light