The top and bottom frame - the same, both have a mutual angle on the front and back side. Own way parameters and quality do not differ from other traditional options, but there is an advantage. If you are heavily damaged one of the frames (top / bottom), then you have no need to buy a new kit, you can simply take the extra frame and replace her damaged.
Weight: 20 gram
Root diameter: M3
Angle: 10 degrees
The kit includes: Motor-frame, 4 x hex screw M3 x 12 mm