I have one set of PD tire warmers, and one set of Woodcraft dual temp. PD tire warmers were all handmade by one guy, if memory serves correct. They use a silicon sheet with a wire wrapped in it, for better heat distribution. The factory Yamaha team order 40 sets from him one year, and I don't think anyone has heard from them since. Luckily I got my order in before hand. The PD are for rear tires no bigger then 180. I've used them on size 160 to 180 rears. Rear power cord was severed once, and repaired. Still look and work great. $250 The Woodcraft I believe are from 160-200 technically? These were my back up warmers. I might have used them one weekend, if that. They are dual temp. Have the LED lights and quick disconnect plugs. Comes with Woodcraft bookbag too. Excellent condition! $350