BikeMaster 525 Bmxr X-Ring Chain Features: BikeMaster 525 Bmxr Series Sealed Chain Ideal O.e.m. replacement Q4 Sealed Chain (Q4 seal - ring chain) offers 1.5 to 2 times longer wear resistance than regular O-ring chains Refined components, 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 provide superior wear resistance and fatigue strength Q4 seal ring offers less friction, which leads to less power loss, almost half that of standard O-ring chains Comes with rivet link Made in Japan