Good Day.

The Skymaster and X-Treme line are both made by Anton at Skymaster.

The X-Treme jets line is a detailed sport scale type ARF. They have Simi Scale landing gear sets and priced for the average jet guy who wants a quality scale jet kit on a smaller budget without sacrificing the quality.

The Skymaster line is much larger and very scale. They using the Airex core sandwich composite system. The landning gear sets are very accurate, Raised panels and blister, Opening canopy systems, Speed brakes, Slats exetra. These are very scale for the jet guy who wants accuracy and a larger ARF jet

Hope this helps..

Jeff