it is a nice motor for lama v4, co-comanche and other co-axial helicopter, whose weight does not exceed 230-250 grams. good quality, long shaft, no vibrations.
sizes:
diameter of rotor - 18mm
height w/o shaft - 23mm
diameter of shaft - 1.98-2.00mm
length of front shaft - 10mm
this motors have only one bad thing - they do not have any aperture for ventilation.