I have a set of STG Single temp tire warmers that are in very good condition. They were my second set of tire warmers, so they didn't get much use and are in great condition. I believe they are actually manufactured by Chicken Hawk for STG. They work very well, heat up fast and get good and hot. Here is a link showing the same set with full details and description on SportBikeTrackGear.com https://www.sportbiketrackgear.com/stg-single-temp-tire-warmer/