Keep you lifters at the RPM red line longer! Isky Racing Cams Red Zone Maximum Endurance Roller Lifters utilize the Marathon Roller Bearing to deliver a longer lasting lifter. The Marathon bearing uses larger-than-normal bearing needles an outer race that is thicker for increased durability. The Red Zone lifters are perfect for high-RPM endurance races, and provide twice the number of drag racing runs over standard lifters.