all gas....i ended up buying the ryobi 780 for $10 because i at least recognize the name and its a geared shaft ......the other 2 are cable....it starts hard and runs furious for a 10 seconds then dead!....ive never been a 2 stroke fan....but it looks like the carb is coming off this one.....i dont know if i can handle a trimmer junkyard! :laughing: