Steel shaft heat treatment, more durable, not easy to break, resistant to explosion. Bearings use imported NSK, magnets use N52 double tile, higher efficiency. New design, no longer use the old buckle, more beautiful and durable, the use of single strand winding, higher performance. Bearing Shaft:4mm Lead:18#AWG200mm Motor Dimensions:33.5mmx17.5mm Framework:12N 14P Peak Current (6S):55A Test item:X2807(1300KV): No.of cells:2S-6S Weight:48.6g(W/0 Silicone Wire) Max.Power (6S):1400W Idle Current (10V):1A Internal Resistance:60mohm Test item:X2807(1700KV): No.of cells:3S-4S Weight:47.9g(W/0 Silicone Wire) Max.Power (6S):900W Idle Current (10V):1.9A Internal Resistance:45mohm Due to different product batches, the appearance may vary, which does not affect the use. Colour:Black Material:Aluminum Alloy Package Contents: 1 * Brushless Motor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.