4-pole high-torque motor design 3.175mm shaft diameter High-purity copper windings maximize efficiency Precision engineered for maximum energy conversion Precision balanced rotor, smoothness for best reliability and maximum RPM Suit for RC car on 1/10th scale Specifications: Watoacute; w: 900W Max voltage: less than 13V Max amps: 69A KV(RPM/Volt):3900KV Max RPM:50000 Diameter: 36mm Length: 50mm Shaft length: 15mm Outer shaft diameter: 3.175mm Inner shaft diameter: 5.00mm Plug type: 4mm gold banana plug Color: black Material: metal + plastic Package content: 1 * motor Only the above package content, other products are not included. Note: Light reflection and roacute; Different displays may cause the color of the item in the picture to be slightly different than it actually is. The allowed measurement error is +/- 1-3cm.