BikeMaster 520 Bmxr X-Ring Chain Features: Ideal O.e.m. replacement Q4 Sealed Chain (Q4 seal - ring chain) offers 1.5 to 2 times longer wear resistance than regular O-rings chains Each refined component, designed with computer analysis, provides higher tensile strength Specially controlled heat treatment means tougher material and more durability Q4 seal ring and reinforced pin and roller provides superior wear resistance and higher impact resistance and fatigue strength Q4 seal ring offers less friction, which leads to less power loss, almost half that of standard O-ring chain BikeMaster 520 Bmxr chains comes with clip link 525 and 530 Bmxr chains comes with rivet link Made in Japan