The product is a set of 4Autolite 65 Copper Core Spark Plugs. These spark plugs have a copper core and are designed for use in ignition systems and components. The product is made by Autolite and comes with a California Prop 65 warning for nickel. The Manufacturer Part Number is 65 and the product is sold as a set of 8. The spark plugs are interchangeable with other brands and part numbers, including Gator Spark Plugs 77-317, Sears STD360924, ACDelco C46 45, Case AO5999AB, Torch G6C, ACDelco 46, Briggs & Stratton 29693, Champion Spark Plug 841S 8411 841, Chrysler 8129840, Motorcraft A7 A7C A71, Motorcraft SP480 AU7PM AT6, Splitfire - Archived SM29E Splitfire - Archived SF29E, NGK 3210 NGK B6S NGK B4, Ford 8U2J12405AX, and DENSO Auto Parts W14-U DENSO Auto Parts 6008.