S&S Cycle SS330-0741 Tappet Cuffs Black for Harley-Davidson Sportster 06-21Factory tappet guides are constructed of plastic and are at risk for allowing the tappets to twist under heavy stress. S&S Tappet Cuffs capture the tappets without impacting vertical motion keeping them perfectly aligned, even in high stress, high RPM situations. FEATURES & BENEFITS Hard anodized black coating Billet aluminum construction Stronger material eliminates distortion Improve tappet stability in high lift and high rpm situations An easy