Steel shaft heat treatment, more , not easy to break, to explosion. Bearings use , magnets use N52 double tile, higher efficiency. design, no longer use the old buckle, more beautiful and , the use of single strand winding, higher performance. Bearing Shaft:4mm Lead:18#AWG200mm Motor Dimensions:33.5mmx17.5mm Framework:12N 14P 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 Due to different product batches, the appearance , 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.