Reviewed By SETH C (SANTA ANA, CA) Reviewed for a 2001 Toyota 4Runner —8/27/2014 8:13 PM
It's a steel heat sink. How can you mess it up? Seriously, I use these on my race car and my daily driver. They glow red and still work just great. Last forever. My brother uses them too. Between the two of us, never a defect or failure.