New revolutionary design with 0.115" of total travel vs. a full travel lifter with 0.200". These lifters will increase rpm by decreasing valve float and valve-train harmonics while maintaining a quiet engine. Travel reduction reduces the amount of oil required to fill the inside of the lifter which reduces oil aeration on steep, fast action high lift camshaft lobes. Designed to limit the amount of oil needed to fill the internals of the lifter. Precision ground needle roller bearing with high chromium steel axle for long life and minimal friction. High-flow disc style quick reacting check valve for better reaction at higher rpm. Sold in a set of four. Made in the U.S.A.