This is a package of two McCoy MC59 Power Plugs. Cold and humid days can be hard on a standard glow plug. Weather conditions like these can make a normally superb plug idle rough or load up in the mid-range. No worries, the new MC59 glow plug has a hotter heat range than most plugs, giving great performance in cold or wet conditions. Racers serious about competition will always have MC59s in their pit box to match race day conditions. Be prepared, and be a winner!