Gas, The child riding harness was $200.00 when my friend sold his to Jimizee last year. Both of us purchased ours from Fun on 2 wheels in Fredrick MD. 5 years ago. There are 2 dealers, 1 in Indiana and 1 in Pa. This is also great for snowmobilies and Jet Skis (used it for both). I am talking to the wife now , to see if we still need ours since granson has literally out grown his. I wil post here 1st if she agrees.