Pro Circuit's Coated Tappets (Buckets) were designed to stand up to higher engine RPM and operating temperatures which could result in unusual cam lobe and tappet wear. The Pro Circuit Coated Tappets will typically last a lot longer than a stock bucket and will prolong the life of your engine's camshaft(s). This is a must have for anyone looking for some type of insurance for your cams! Designed to stand up to higher engine RPM and operating temperatures. Last a lot longer than a stock bucket. Sold in pairs.