I left my tire warmers plugged in while out on the track (Stupid). Burned through the outside. I thought they were toast, but plugged them in tonight and they heat up. Front one looks good but the back warmer looks ugly, but did the job. I have new ones on the way so selling these. I'll give you some type of money back guarantee just in case they really are toast. They are Street and Comp band (I think Chickenhawk, but not sure where Miles gets his.) Ask for Mike in garage 17N. I'll be there Thursday and Friday, but unfortunately I won't be racing Saturday and Sunday.