The Copper Plus Champion Spark Plug 401 is a high-quality spark plug designed for improved ignition systems in cars and trucks. With its OE/OEM part number Rs12yc and manufacturer part number 401, this Champion spark plug is a trusted and compatible choice for automotive ignition systems.
These were brand new spark plugs at about half the price I can't see how any one could go wrong on these. Champion is a long standing brand with good quality.