3900KV brushless motor and 120A brushless ESC (with programming card) set. Made of electronic component, durable, firm and has a long service life. Fine workmanship, good performance. install and remove. Upgrade parts design, and improve the performance of the rc car. Specification: Material: Electronic Component Size Chart: Brushless Motor: Diameter: 36mm/1.41inch Length: 50mm/1.96inch Shaft Length: 15mm/0.59inch Outer Shaft Diameter: 3.18mm/0.12inch Inner Shaft Diameter: 5.00mm/0.19inch Programming Card: 8x5.4x1.3cm/ 3.14x2.12x0.51inch Package Includes: 1 Piece 120A Brushless ESC 1 Piece Brushless Motor 1 Piece Programming Card 1 Piece Electronic Radiator : Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.