This is an injection-plastic jet aircraft model kit.
From the manufacturer:
Avia continued building Messerschmitt Bf 109G-6s after the war, but soon ran out of the 109's Daimler-Benz DB 605 engine after many were destroyed during an explosion at a warehouse in Krasne Brezno. The S-199 continued to use the Bf 109G airframe but, with none of the original engines available, an alternative engine had to be used. It was decided that as a replacement, the aircraft would use the same engine (Junkers Jumo 211 F) and propeller as the Heinkel He 111 bomber.
This kit is molded in grey and clear plastic and includes decals for two marking schemes.