This is the Axial 27T 540 Electric Motor. FEATURES: 540 size can replaces many stock motors INCLUDES: One 540 27T Electric Motor REQUIRES: ESC SPECS: Shaft Diameter: 3mm (0.12") Shaft Length: 12.45mm (0.49") Can Diameter: 36mm (1.42") Can Length: 49.7mm (1.96") Total Length: 72mm (2.83") Wire length: 88.9mm (3.5") Specs such as input voltage and weight were not provided by manufacturer cnh 6/10/08 ir/jxs