I buy quite a few of these throughout the year. Application is a slick-shod race car, 1615cc Hayabusa (extremely potent) powerplant. Most (all) other competitors use a stronger Drag Chain, but I find these run hot and (because they) don't retain the grease. So far, I have yet to break a ZXMX/ZVMX2, good sealed chain. I wish SBS stocked the links too..