Accessories and Parts -ESC Electric Speed Controller for RC Brushless Motor Highlights Generic Brand ESC Electric Speed Controller for RC Brushless Motor Description: 3900KV brushless motor and 120A brushless controller set (with programming card). Made of electronic component, durable, firm and has a long service life. Nice work, good performance. Easy to install and remove. Upgrade parts design and improve rc car performance. Specification: Material: Electronic Component Size Chart: Brushless Motor: Diameter: 36mm/1.41in Length: 50mm/1.96in Shaft Length: 15mm/0.59in Shaft Outer Diameter: shaft: 3.18mm/0.12inch Inner shaft diameter: 5.00mm/0.19inch Programming card: 8x5.4x1.3cm/3.14x2.12x0.51inch Package includes: Brushless ESC 1 piece 120A Brushless Motor 1 piece Programming Card 1 piece Electronic Heatsink 1 piece Note: Color may be slightly different due to the color calibration of each individual monitor. Please allow slight measurement deviation due to manual measurement.