This 2GT-6-400mm closed belt is made...
Micro motor with metalic gears (6V, 96 RPM)
This 7 x 16 mm miniature motor with 1mm shaft is very ideal for your model airplanes.
This pair of 125 RPM DC gear motor and wheel is perfect for your car or robot projects. The gear motor works well with power between 3V and 6V.