Made in USA. Melling timing set includes timing chain (4), timing chain tensioner (4), timing chain tensioner arm (2), and timing chain guides (2) for 12 pieces in this kit. Melling timing chain kits provide an efficient and economical way to provide the timing components needed for a quality engine rebuild. Timing chain options include both standard and roller chains to provide matches with the high quality sprockets and if necessary tensioner and guides that fit the application. Both OEM and performance timing chain kits are available. Melling chains and sprockets are manufactured using the highest designs, quality materials and workmanship. Melling chain kits offer you the coverage and choices of standard, HD and performance to fulfill your timing needs at every service level.