This combo kit is a fine-tuned propulsion system specifically engineered for multi-rotor copters weighing 3-5kg.

Specifications:

KV: 350
Configuration: 12N14P
Shaft Diameter（Outside): 4mm
Shaft Diameter（Inside): 5mm
Motor Dimensions(Dia.*Len): Φ41.8*26.5mm
Weight (g): 113g
ldle current(10)@10v(A): 0.3A
No.of Cells(Lipo): 3-8S
Max. efficiency current: (3-8A)>85%
Internal resistance: 0.23Ω

ESC

RCTimer HVSK-40A High Voltage OPTO Brushless ESC
Continuous current: 40A
Instant current(10S): 60A
BEC type: N/A
BEC output: OPTO
Battery cell: Li-io Li-poly 2-6S; NiMH NiCd 5-21
Weight:29g
Dimension L*W*H: 66*26*13mm Included the Deans

Package included:

4 * Rctimer HP3510-350KV motor 
4 * Rctimer HVSK 40A