S&S Cycle Hydraulic Tappets 33-5350 Reduced valve train noise from start up to shut down Close tolerances for low leak down rates - fast pump up and superior high rpm performance Low mass, bearing grade, silicon nitride check ball and lighter check ball spring - enhances fast pump up and quiet operation 100% tested to ensure that leak down and top end oil flow are within specification Sold as a set of 4, HL2T kit not included