This used OS FT 120 Twin Gemini glow engine is a 4-stroke engine designed for use in airplanes. Made in Japan, it is compatible with nitro and glow fuel and has a range of compatible scales including 1:20, 1:4, 1:5, and 1:6.

The engine has superb compression, is in great condition and is a great option for those looking for a reliable and powerful engine for their RC airplane. With its OS brand name and twin design, the OS FT 120 Twin Gemini glow engine is a highly sought-after product among RC enthusiasts.