HomeMaytech 4000KV Specifications:-KV: 4000kv-Size: 28x30mm-Shaft: 3.16mm-Battery/Esc: 2-3s Lipo / 20~30A-Weight: 55g-Motor mounting holes 16 and 19mm.Maytech 2830 Brushless MotorSKU: Mystery2830$26.50PriceOut of Stock